To be blunt, no not really. I am in roughly the same boat as you, and many others here in that I made extensive use of the peer to peer backup functionality of Crashplan. I have been searching for a while now but to my knowledge there is nothing that provides the same level (or even a comparable level) of functionality as Crashplan did. Syncthing does have the ease of setup/connecting computers that crashplan did, but it is most definitely not a backup solution (sync is not backup, and its versioning capabilities hardly count). Borg Backup is another possibility but it does not provide an easy to use setup for peer to peer backups. Also its deduplication capabilities are less than ideal for multiple machines. Duplicacy is a new player in the world of backup tools. It appears to have great deduplication capabilities, but the software is still very new and as with Borg there is no easy p2p. Also Duplicacy uses a repo/snapshot model for backup, which so far as i can tell doesnt currently allow for the file versioning granularity that i need. For now I am continuing my search until my Crashplan subscription expires, using syncthing as a stopgap solution to get remote files to my unRAID server where crashplan can back them up.