A owncloud that contains countless good things.

https://owncloud.org/faq/

Https://doc.owncloud.org/server/6.0/user_manual/files/files.html

Plus the free open source Getnas is even more powerful:

Http://www.getnas.com/2015/03/254.html

Http://www.getnas.com/2015/06/2001.html

It can also be combined with SFTP:

Http://pulipuli.blogspot.fr/2014/07/owncloudsftp-combine-sftp-in-owncloud.html

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http://ftpbox.org/
Https://github.com/FTPbox/FTPbox

http://sparkleshare.org/
Https://github.com/hbons/SparkleShare

Http://webmodelling.com/webbits/miscellaneous/bacula.aspx
Http://allen-study.blogspot.tw/2012/10/backup-bacula-on-ubuntu-1204-chinese.html

https://www.syncany.org/

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Https://en.wikipedia.org/wiki/List_of_backup_software

Https://www.quora.com/Is-there-something-similar-to-Dropbox-that-lets-me-use-my-own-server

Http://www.zisync.com/contact

We are the Chinese Academy of Sciences of the incubation of the incubator team, from Tsinghua, CAs, Beihang and other well-known institutions of doctorate/master composition, and in the well-known internet companies have a wealth of work experience. Team since the beginning of 2012, has been engaged in the field of cloud storage related work, in the enterprise data storage, file management, file synchronization has a deep technical accumulation, has developed a private cloud enterprise (data Ark), A Home data center (a Moonlight Box) and now a multi-peer sync tool (self-synchronizing) for the C-side. Currently the team operates mainly from synchronized products, to create a most efficient file synchronization sharing tool for users!

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See Also what is some open source alternatives to dropbox? 

There is five  cloud clients  that I am aware of (thank you Rudolf Olah For the Ifolder and owncloud references), that is, for choice of cloud/drive storage. This was different from software to allows creation of Cloud Services on one's own computers, such as HTTP://OPEN.EUCALYPTUS.COM/  This was also different from the other services mentioned above which provide clients and services (though Jungle Disk does Allow choice of cloud providers it was still managed by the main SaaS provider).

• Unilium http://www.unilium.com/
• Cyberduck http://cyberduck.ch/
• Syncany http://www.syncany.org/
• IFolder http://www.ifolder.com/
• Owncloud http://owncloud.org/

A owncloud that contains countless good things.