I've been very happy with Borg[0] combined with the B2 command-line tools for Linux backups. I switched from Duplicity + AWS and it reduced the cost as well as made the backup process simpler - Borg doesn't have the same full vs incremental difference to think about, you just take a full backup each time and it dedupes everything automatically.
For my use I'm primarily concerned with an off-site copie of a folder full of files (mainly pictures/videos), so the basic sync works just fine for my case. It even keeps versions of files [1] in case you corrupt/delete/overwrite a file.
What is it missing that Crashplan and Backblaze Personal Backup have?
$5/mo of B2 is about 1TB of storage, so if you're above that then maybe cost is a factor?
It's cheaper then backblaze, slightly. It's not really comparable, because it's not distributed and there is real risk of data loss. However, for my needs, it works as part of a comprehensive backup plan. I get a bit more bang for my buck and more flexibility.
