I built a disaster recovery system using python and borg. It snapshots 51 block devices on a SAN and then uses borg to backup 71 file systems from these snapshots. The entire data set is then synced to S3. And yes, I've tested the result in a offsite: recovering files systems to entirely different block storage and booting VMs, so I'm confident that it would work if necessary, although not terribly quickly, because the recovery automation is complex and incomplete.

I can't share it. But if you contemplate such a thing, it is possible, and the result is extremely low cost. Borg is pretty awesome.