[StavrosK]

After finding Backupsy (and RamNode, which a commenter suggested), I've found the holy grail of backup solutions. I will write a simple backup script that mounts a remote directory (through SSH or whatever), mounts an EncFS directory on that and rdiff-backups files onto it.

This will give you encrypted, snapshotted backups using open-source systems, that are better than Duplicity because you don't have to be creating full backups every so often. If you'd be interested, you can subscribe to my mailing list at http://bit.ly/stavroslist or follow me on Twitter or something, but please post comments below so I know what functionality to include.

[buro9]

I just use Tarsnap for this scenario: http://www.tarsnap.com/

What I am looking for is a folder that syncs, but is secure and open source.

BitTorrent Sync is the closest to how it should work, but is not open source: http://labs.bittorrent.com/experiments/sync.html

[StavrosK]

Tarsnap is ideal, but it's around $27 a month, versus $3.

[buro9]

It's a question of how much you're backing up... my Tarsnap use and cost is very low.

I retain off-site encrypted HDD images updated once a month of things like media which constitute the vast majority of my data and do not need daily snapshots.

[StavrosK]

Yeah, I want to back up my media as well (around 90 GB), but I want my backups to just work. Tarsnap would have been fine if not for the cost, so a tool that combines EncFS + SSH + rdiff-backup will be ideal for me.