>What should happen in the case of missing a file deletion until beyond Dropbox's 30-day versioning windows is that you retrieve the file from your automated backups of at least one of the computers that Dropbox is syncing to.
What would you use for these automatic backups? I use backblaze for my whole computer. However, I think they also only keep file changes for 30 days past change date.
I use TimeMachine and three large harddrives - a pair in raid1 that TimeMachine does it's normal thing with, then another drive that powers up once a week and rsyncs off that raid pair.
If I were _properly_ paranoid, I'd also set up an off-site backup drive - perhaps using TahoeLAFS. I figure the chance of Dropbox losing my data at the same time as I lose three bits of electronics at my house is pretty small.
For non OSX users, you can fairly trivially roll-your-own TimeMachine-like snapshot backup process in Linux using rsync, cron, and a little bash - it's not like Apple invented it... It might even be just as simple using Powertools on Windows.
I use Crashplan, which is a little slower and clunkier than other services but keeps infinite versions of files, including deleted files (unlike Backblaze).
I could try Crashplan again. When I attempted it before, it never successfully synced, despite hours spent emailing system reports back and forth with their support reps.
I would pay Backblaze double if they kept past versions.
It worked fine for me until I got more data than my plan supported. It was screwed after that, I deleted some stuff I didn't need, but it had already gotten into a borked state and support couldn't even help me fix it.
What would you use for these automatic backups? I use backblaze for my whole computer. However, I think they also only keep file changes for 30 days past change date.