Is there any P2P private file storage?

There are two solutions that I know of that provide this:

• Crashplan – you can trade storage with your friends.
• Buddybackup – ditto.

http://skeptu.com/p2p-backup-software keeps an updated list of such software.

Freenet is the one project that springs to mind.

Freenet is free software which lets you anonymously share files, browse and publish "freesites" (web sites accessible only through Freenet) and chat on forums, without fear of censorship. Freenet is decentralised to make it less vulnerable to attack, and if used in "darknet" mode, where users only connect to their friends, is very difficult to detect.

Otherwise there is a list of distributed file storage systems at http://www.infoanarchy.org/en/Distributed_file_storage

It appears that a number of the projects are dead though, MNet was last updated in 2005... not sure about any of the others.

We have also BuddyBackup

http://www.buddybackup.com/about/how-buddybackup-works.aspx

Also Microsoft's Live Mesh is similar, but limited to your machines and the central storage

http://www.techcrunchit.com/2008/07/21/live-mesh-rolls-out-p2p-storage/

As for research projects, we also have:

• Microsoft's PAST (2001-2010) http://research.microsoft.com/en-us/um/people/antr/PAST/
• National Tsing Hua University's Malugo (2009) http://ir.lib.nthu.edu.tw/handle/987654321/17890
• Nanyang Technological University's CrowdStore (2009-2012) http://sands.sce.ntu.edu.sg/p2pstorage/