List of online backup services - AbsoluteAstronomy.com

Comparison

Provider	crypt.	Limited MB Megabyte The megabyte is a multiple of the unit byte for digital information storage or transmission with two different values depending on context: bytes generally for computer memory; and one million bytes generally for computer storage. The IEEE Standards Board has decided that "Mega will mean 1 000... plan	Unlimited MB Megabyte The megabyte is a multiple of the unit byte for digital information storage or transmission with two different values depending on context: bytes generally for computer memory; and one million bytes generally for computer storage. The IEEE Standards Board has decided that "Mega will mean 1 000... plan	$/MB Megabyte The megabyte is a multiple of the unit byte for digital information storage or transmission with two different values depending on context: bytes generally for computer memory; and one million bytes generally for computer storage. The IEEE Standards Board has decided that "Mega will mean 1 000... plan	Unlimited BW Bandwidth (computing) In computer networking and computer science, bandwidth, network bandwidth, data bandwidth, or digital bandwidth is a measure of available or consumed data communication resources expressed in bits/second or multiples of it .Note that in textbooks on wireless communications, modem data transmission,...	Net drive	Sync File synchronization File synchronization in computing is the process of ensuring that computer files in two or more locations are updated via certain rules....	Public file hosting	Server location	Free online storage (non-trial)	Maximum per-file size	External hard drive support
Sky Backups											no limit
9GBackup											no limit
Acronis Acronis Acronis, Inc. is an international computer software company, dealing in the area of computer backup, disaster recovery, bare-metal restore, system deployment, and storage management in both Windows and Linux systems.-History:...		250 Gb							USA, Europe Europe Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...		no limit
ADrive ADrive ADrive.com is a corporation located in the United States, founded in 2007, which uses cloud storage to provide online backup, file sharing, and online data storage. ADrive's browser-based file manager is compatible with Windows, Linux and Mac and has familiar file operations as well as options...	, only paying users					, only paying users			USA	50 GB	2 GB
ASUS WebStorage ASUS WebStorage ASUS WebStorage, operated by eCareme Technologies, Inc., is a cloud application service that enables users to back up, sync, and share files across PC, Pad, and Smartphone....									USA, ASIA Asia Asia is the world's largest and most populous continent, located primarily in the eastern and northern hemispheres. It covers 8.7% of the Earth's total surface area and with approximately 3.879 billion people, it hosts 60% of the world's current human population...	2 GB
Backblaze Backblaze Backblaze is an online backup tool that allows Windows and Mac OS X users to back up their data to an offsite data center. The service is designed for end-users, providing unlimited storage space and supporting unlimited file sizes. It allows the user to back up data continuously, manually, when...	; Per-user								USA		No limit
Barracuda Backup Service Barracuda Networks Barracuda Networks, Inc. is a privately held company providing security, networking and storage solutions based on appliances and cloud services. The company’s security products include solutions for protection against email, web surfing, web hackers and instant messaging threats such as spam,...		fee per computer							USA, APAC APAC APAC or Apac may refer to:* Apac, a city in the Apac District of Uganda* Apac District, in Uganda* APAC Customer Services* Asia-Pacific * Asia, Pacific and Africa Collections at the British Library... , Europe Europe Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...	, aimed at commercial users
BullGuard Backup BullGuard BullGuard is a UK-based, privately held software company that produces internet security products for home users and small businesses. It has offices in Denmark, Romania, The UK, Sweden, Benelux, France, Germany, Australia and the USA....									Europe Europe Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...
Carbonite Carbonite (online backup) Carbonite is an online backup service, available to Windows and Mac users, that backs up documents, e-mails, music, photos, and settings. It is named after carbonite, the fictional substance used to freeze Han Solo in Star Wars: The Empire Strikes Back. The generic purple color used on the...		(Business only)	(Home only)	(Business only)		(Pro only)			USA		4 GB (default)
Comodo Backup Comodo Backup Comodo Backup is a free data backup program that backs up Windows data files to local, network, virtual or online storage.-Overview:Comodo Backup can be scheduled to backup files and its synchronization mode will take backups of data files which can be restored at a later date.-User...				(5)					USA
Provider		MB Megabyte The megabyte is a multiple of the unit byte for digital information storage or transmission with two different values depending on context: bytes generally for computer memory; and one million bytes generally for computer storage. The IEEE Standards Board has decided that "Mega will mean 1 000... plan	MB Megabyte The megabyte is a multiple of the unit byte for digital information storage or transmission with two different values depending on context: bytes generally for computer memory; and one million bytes generally for computer storage. The IEEE Standards Board has decided that "Mega will mean 1 000... plan	MB Megabyte The megabyte is a multiple of the unit byte for digital information storage or transmission with two different values depending on context: bytes generally for computer memory; and one million bytes generally for computer storage. The IEEE Standards Board has decided that "Mega will mean 1 000... plan	BW Bandwidth (computing) In computer networking and computer science, bandwidth, network bandwidth, data bandwidth, or digital bandwidth is a measure of available or consumed data communication resources expressed in bits/second or multiples of it .Note that in textbooks on wireless communications, modem data transmission,...		Sync File synchronization File synchronization in computing is the process of ensuring that computer files in two or more locations are updated via certain rules....				Maximum per-file size
Crashplan Crashplan CrashPlan is backup software that allows Windows, Mac, Linux and Solaris users to back up their data to an offsite data center, computers belonging to friends and family, as well as to attached drives / shared folders. There is a free version and CrashPlan+ which is for backing up to CrashPlan's...	; Per-user, per-computer								USA		No Limit
Datapreserve Datapreserve DataPreserve is an online backup and storage service online data backup and storage service for Small and Medium Sized Businesses. Their service uses an enterprise class backup software which automatically backs up local files to a private cloud data center over the internet.DataPreserve was...									USA
Dell Dell Dell, Inc. is an American multinational information technology corporation based in 1 Dell Way, Round Rock, Texas, United States, that develops, sells and supports computers and related products and services. Bearing the name of its founder, Michael Dell, the company is one of the largest... Datasafe		10, 30, 50, 100 GB								2 GB
Dolly Drive Dolly Drive Dolly Drive is a cloud backup service that allows Mac users to back up their data to an offsite data center utilizing Apple’s Time Machine TM interface. Dolly Drive expanded it’s grid to the EU in September 2011...									USA, Europe Europe Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...			Yes
Diino Diino Diino is a cloud storage provider, offering online backup data storage and file sharing. The company, Diino Systems AB, was founded 2004 and is based Stockholm, Sweden, with sales offices in France, Spain, Mexico and the US...											No limit
Dropbox	; transmission and storage only					; third-party webdav WebDAV Web-based Distributed Authoring and Versioning is a set of methods based on the Hypertext Transfer Protocol that facilitates collaboration between users in editing and managing documents and files stored on World Wide Web servers... service, 300 MB write limit apply			USA	2 GB	300 MB on the Web Interface, none on the Desktop client
Egnyte Egnyte Egnyte is a computer technology company providing cloud computing infrastructure for online file storage, file sharing and computer backup for small, medium, and large business enterprises....									USA		No limit
ElephantDrive ElephantDrive ElephantDrive is a storage virtualization service used primarily as an online backup tool, but also as a remote access service/collaboration tool...	; Per-user									2 GB
Fabrik Ultimate Backup Fabrik Inc. Fabrik Inc. is a manufacturer of external hard drives and digital content management software and services. Fabrik is the third largest supplier of external storage products in North America...									USA		5GB
FilesAnywhere Filesanywhere is the creation of Dallas-based software design and consulting firm, Officeware systems, and is a provider of remote file storage and file sharing for consumers and corporations...						, WebAdvanced accounts and up.			USA	1GB	No limit
F-Secure F-Secure F-Secure Corporation is an anti-virus and computer security software company based in Helsinki, Finland. The company has 18 country offices and a presence in more than 100 countries, with Security Lab operations in Helsinki, Finland and in Kuala Lumpur, Malaysia...									Europe, US, APAC, several ISP-specific locations	Depending on local offering (by ISP)	8GB
Humyo Humyo humyo.com is an online file storage service which synchronizes files across multiple computers and a remote data store. Files stored in humyo can be shared with other users and published on web pages...									United Kingdom United Kingdom The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...
IDrive I-drive i-drive was an online data storage service that was founded in December 1997 by Jeff Bonforte with seed investors and launched its first product, a pioneering online file storage service in August 1999. The idea originated from an early company Jeff Bonforte co-founded in 1996 called...	; Per-user; Does NOT encrypt file-names								USA	5 GB
Jungle Disk Jungle Disk Jungle Disk is an online backup tool that stores its data in Amazon S3 or Rackspace Cloud Files. It was highlighted by Amazon as one of the earliest S3 clients The basic Jungle Disk software is sold as a monthly subscription model, and the customer is billed directly by Amazon for data storage and...	; Per-user								USA, Europe Europe Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...		5 GB
KeepVault KeepVault KeepVault is a backup service that protects a user's data via cloud storage and via the user's own local backup hard drive device. Thus, KeepVault is both an online backup tool and a local backup solution. KeepVault protects the user against hard drive failure and other forms of data loss...	; Per-user								USA		20 GB
Livedrive Livedrive Livedrive is an online backup service provider based in London in the UK. Livedrive offers unlimited backup and online file storage. Their main products are backup and briefcase.- Functionality :...									UK
Memopal Memopal Memopal is a cloud-based storage application and service that enables users to store and synchronize computer files and share files and folders with others using the Internet.-Functionality:...									Europe Europe Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting... , USA, Asia Asia Asia is the world's largest and most populous continent, located primarily in the eastern and northern hemispheres. It covers 8.7% of the Earth's total surface area and with approximately 3.879 billion people, it hosts 60% of the world's current human population...	3 GB	5 GB
MiMedia MiMedia MiMedia is a cloud-based online backup service. It was launched in 2010 by technology startup company MiMedia, LLC, based in Port Chester, New York. MiMedia is similar to a number of other backup services, such as Mozy, Carbonite, and Dropbox....	; During upload									7 GB	3 GB
MobileMe MobileMe MobileMe was a subscription-based collection of online services and software offered by Apple Inc. Originally launched on January 5, 2000, as iTools, a free collection of Internet-based services for users of Mac OS 9, Apple relaunched it as .Mac on July 17, 2002, when it became a paid subscription... (Apple)
Provider		MB Megabyte The megabyte is a multiple of the unit byte for digital information storage or transmission with two different values depending on context: bytes generally for computer memory; and one million bytes generally for computer storage. The IEEE Standards Board has decided that "Mega will mean 1 000... plan	MB Megabyte The megabyte is a multiple of the unit byte for digital information storage or transmission with two different values depending on context: bytes generally for computer memory; and one million bytes generally for computer storage. The IEEE Standards Board has decided that "Mega will mean 1 000... plan	MB Megabyte The megabyte is a multiple of the unit byte for digital information storage or transmission with two different values depending on context: bytes generally for computer memory; and one million bytes generally for computer storage. The IEEE Standards Board has decided that "Mega will mean 1 000... plan	BW Bandwidth (computing) In computer networking and computer science, bandwidth, network bandwidth, data bandwidth, or digital bandwidth is a measure of available or consumed data communication resources expressed in bits/second or multiples of it .Note that in textbooks on wireless communications, modem data transmission,...		Sync File synchronization File synchronization in computing is the process of ensuring that computer files in two or more locations are updated via certain rules....				Maximum per-file size
Mozy Mozy Mozy is an online backup service for both Windows and Mac users. The cloud service allows users to back up data continuously, manually or schedule updates. Mozy is known for offering backup storage space for home and business users. In 2011, they changed to their current tiered pricing model...	; Per-user								USA, Europe Europe Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...	2 GB
Skyfile	; Per-user									2 GB	No limit
SOS Online Backup SOS Online Backup - History :Founded in 2001 the company is headquartered in El Segundo, California, and had offices in Australia, India, and the Ukraine. It has eleven datacenters around the world including five in the United States, with others in Canada, Australia, United Kingdom, India, and Ukraine.Their core...	; Per-user								USA, Canada Canada Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean... , Europe Europe Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting... , APAC APAC APAC or Apac may refer to:* Apac, a city in the Apac District of Uganda* Apac District, in Uganda* APAC Customer Services* Asia-Pacific * Asia, Pacific and Africa Collections at the British Library...		No limit
SpiderOak Spideroak SpiderOak is an online backup tool for Windows, Mac and Linux users to back up, share, sync, access and store their data using an off-site server. SpiderOak allows the user to backup any given folder of his/her computer...	; Per-user									2 GB	No limit
SugarSync	; transmission and storage only							(SugarSync account needed)		5 GB
Symantec Online Backup Symantec Online Backup Symantec Online Backup is an online remote backup service that provides businesses with a system for backing up and storing computer files over the Internet...				(5)					USA
Syncplicity Syncplicity Syncplicity is a backup and synchronization service provided by Syncplicity Inc. The service allows users to store and sync files online between computers...									USA	2 GB
Ubuntu One Ubuntu One Ubuntu One is a personal cloud service operated by Canonical Ltd.The service enables users to store files online and sync them between computers and mobile devices, as well as stream audio and music from cloud to mobile devices.- Features :...						N/A (6)				5 GB	5 TB
Unitrends Vault2Cloud Unitrends Unitrends Inc. is a United States based company specializing in network-based disk-to-disk, vertically-integrated backup appliances for business continuity and disaster recovery.-Products:...									USA
UpdateStar Online Backup	; Per-user								Europe Europe Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...
Windows Live Mesh Windows Live Mesh Windows Live Mesh is a free-to-use Internet-based file synchronization application by Microsoft that is designed to allow files and folders between two or more computers be in sync with each other on Windows and Mac OS X Windows Live Mesh (formerly known as Live Mesh, Windows Live Sync and...	; Transmission-only									5 GB
Windows Live SkyDrive Windows Live SkyDrive Windows Live SkyDrive, initially called Windows Live Folders, is a free-of-charge file hosting service that allows users to upload files to a cloud storage and then access them from a Web browser...							; through windows live mesh			25 GB	100 MB
Wuala Wuala Wuala is a secure online storage, file synchronization, versioning and backup, service, originally developed and run by Caleido Inc., which is now part of LaCie. Service is a combination of:...									Europe Europe Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...	2 GB	14 GB
Zmanda Cloud Backup Zmanda Cloud Backup Zmanda Cloud Backup is an online backup software by open source backup company Zmanda which enables users to back up their data to cloud storage...									USA, Europe Europe Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting... , Singapore Singapore Singapore , officially the Republic of Singapore, is a Southeast Asian city-state off the southern tip of the Malay Peninsula, north of the equator. An island country made up of 63 islands, it is separated from Malaysia by the Straits of Johor to its north and from Indonesia's Riau Islands by the... , Japan Japan Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...		No Limit
ZumoDrive ZumoDrive ZumoDrive is a cloud-based file synchronization and storage service operated by Zecter, Inc. On December 22nd, 2010, Zecter announced its acquisition by Motorola Mobility. The service enables users to store and sync files online and between computers using their HybridCloud storage solution...	; transmission and storage only								USA	2 GB	No Limit
Provider		MB Megabyte The megabyte is a multiple of the unit byte for digital information storage or transmission with two different values depending on context: bytes generally for computer memory; and one million bytes generally for computer storage. The IEEE Standards Board has decided that "Mega will mean 1 000... plan	MB Megabyte The megabyte is a multiple of the unit byte for digital information storage or transmission with two different values depending on context: bytes generally for computer memory; and one million bytes generally for computer storage. The IEEE Standards Board has decided that "Mega will mean 1 000... plan	MB Megabyte The megabyte is a multiple of the unit byte for digital information storage or transmission with two different values depending on context: bytes generally for computer memory; and one million bytes generally for computer storage. The IEEE Standards Board has decided that "Mega will mean 1 000... plan	BW Bandwidth (computing) In computer networking and computer science, bandwidth, network bandwidth, data bandwidth, or digital bandwidth is a measure of available or consumed data communication resources expressed in bits/second or multiples of it .Note that in textbooks on wireless communications, modem data transmission,...		Sync File synchronization File synchronization in computing is the process of ensuring that computer files in two or more locations are updated via certain rules....				Maximum Per-File Size	External Hard Drive Support

Legend

Windows
Microsoft Windows
Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces . Microsoft Windows came to dominate the world's personal...

/Linux
Linux
Linux is a Unix-like computer operating system assembled under the model of free and open source software development and distribution. The defining component of any Linux system is the Linux kernel, an operating system kernel first released October 5, 1991 by Linus Torvalds...

/Mac
Mac OS X
Mac OS X is a series of Unix-based operating systems and graphical user interfaces developed, marketed, and sold by Apple Inc. Since 2002, has been included with all new Macintosh computer systems...

- Supported operating systems for thick client (native binary application), which provide background data transmission and setting services.Encryption - Data stored by the service is encrypted. (Transport security

Transport Layer Security

Transport Layer Security and its predecessor, Secure Sockets Layer , are cryptographic protocols that provide communication security over the Internet...

is also assumed) Payment method

- L - Pay per computer. Additional fee for storage over a threshold.
- U - Pay per computer. Storage per computer is unlimited.
- M - Pay per unit of storage, but unlimited computers may share that storage.
- B - Bandwidth capping or limits are used on accounts.Net drive - Network drive on file server supports some protocols (FTP
  File Transfer Protocol
  File Transfer Protocol is a standard network protocol used to transfer files from one host to another host over a TCP-based network, such as the Internet. FTP is built on a client-server architecture and utilizes separate control and data connections between the client and server...
  
  , SMB
  Server Message Block
  In computer networking, Server Message Block , also known as Common Internet File System operates as an application-layer network protocol mainly used to provide shared access to files, printers, serial ports, and miscellaneous communications between nodes on a network. It also provides an...
  
  , NAS
  Network-attached storage
  Network-attached storage is file-level computer data storage connected to a computer network providing data access to heterogeneous clients. NAS not only operates as a file server, but is specialized for this task either by its hardware, software, or configuration of those elements...
  
  ,...)P2P storage - data spread over many computers based on Peer-to-peer
  Peer-to-peer
  Peer-to-peer computing or networking is a distributed application architecture that partitions tasks or workloads among peers. Peers are equally privileged, equipotent participants in the application...
  
  net advantagesSync - Synchronization
  File synchronization
  File synchronization in computing is the process of ensuring that computer files in two or more locations are updated via certain rules....
  
  between computers, and/or mobile devices (PDA, MDA,...)Public Internet file hosting -Restore via physical media -Server location - country where physical servers are located Still in Beta version Whether the desktop client (if available) can detect and upload changes without scanning all files Many backup services offer a limited free plan, often for personal use. Often it is possible to increase the free backup limit through coupons, referrals, or other means that are not included in this column. This column also does not include free trials that are only available for a limited period of time. External hard drive support - Can refer to an alternate backup destination or whether the service can back up external drives.

Comments

Acronis : up to 5PCs, always incremental backups, remote access from the web
Backblaze : Data de-duplication; block-level incremental
Barracuda Backup Service : Data de-duplication; real-time hybrid onsite/offsite data back-up
BullGuard Backup : 5PC/license, fast upload speeds, mobile access, encrypted transfer and storage, password-protected settings, free 24/7 support
Carbonite : Block-level incremental, Home or Pro Editions. iPhone/ Black berry/ Android App available To remotely access data from the online backup (For Pro: Users of the computer which are backed up, Not available for the Administrator of the Pro). Can manually select files to upload that are larger than 4 GB.
Crashplan : Unlimited destinations. Data de-duplication; block-level incremental. Can run server-free, exchanging backup space with friends and family.
Dolly Drive : Only Cloud Storage that integrates Apple's Time Machine
Diino : iPhone/Android app available.
Dropbox : Data de-duplication, delta sync, iPhone/Android/Blackberry app available.
Egnyte : Delta sync, Google Docs sync, user and group management
ElephantDrive : Auto-transfer from defunct Xdrive.
Fabrik Ultimate : Backup Block-level incremental backups, Encryption: 128 bits standard, 448 bits optional, limited account of up to 3 GB is free. Acquired by Hitachi. According to their tech support, their offering is a branded version of Memopal.
FilesAnywhere : Mark Cuban acquired minority interest in 2006. Android, iOS, BlackBerry Apps available. Dedicated server options available. CoolBackup software used for Backup/Sync.
F-Secure : [Steek acquired by F-Secure July 2009]
Humyo : Humyo was acquired by Trend Micro and will become part of Trend Micro SafeSync. Humyo no longer accepts new clients.
IDrive : Proprietary license download client. Automatic Selection. Continuous Data Protection."Virtual drive" explorer.
Jungle Disk : Proprietary license download client sample code.
KeepVault : Real-time hybrid onsite / offsite data backup
Memopal : Cross-user de-duplication, delta sync
MiMedia : Initial seed via a MiMedia-owned external hard drive available (no extra cost, shipping included).
Mozy : Data de-duplication; block-level incremental
Skyfile : Data de-duplication."Zero Knowledge" encryption.
SpiderOak : Data de-duplication."Zero Knowledge" encryption.
Syncplicity : Google Docs sync, Central Management with Business Console
Ubuntu One : GPL client
Unitrends Vault2Cloud : Data de-duplication; hybrid on- & off-premise data backup; physical seeding
UpdateStar Online Backup : Data de-duplication; block-level incremental
Windows Live Mesh : replaces windows live sync and windows live folder
Wuala : Client-side encryption
Zmanda Cloud Backup : Available in German and Japanese languages, supports MS SQL Server, MS Exchange, SharePoint, MySQL Database, System State, Oracle
ZumoDrive : Cloud appears local to filesystem, content streaming, predictive caching, delta sync

Versioning

Any changes can be undone, and files can be undeleted.
9GBackup : Versions are set by the user when choosing the file/folder to backup. Versions can be set to unlimited but they do use the storage that you have purchased.
Acronis : supports detailed history of changes to files with browsing by date or version number
Backblaze : Old versions of files are kept for 30 days.
Crashplan : Options: All, or staged (daily, then weekly, etc.)
Dolly Drive : Yes
Dropbox : Yes
Skyfile : All versions are kept. All files can be undeleted.
SOS Online Backup : All versions are kept. 0nly the largest counts towards the storage limit.
SpiderOak : All versions are kept. All files can be undeleted.
SugarSync : Five versions are kept. Only the most recent counts towards the storage limit.
Wuala : Ten versions are kept. Only the most recent counts towards the storage limit.

Comparison

Legend

Comments

Versioning

See also