I use Borgbackup 1.2.x. It works really well. Significantly faster than Duplicity. Borg uses block-level deduplication instead of doing incremental backups, meaning the backup won't grow indefinitely like with duplicity (this is why you have to periodically do a full backup with Duplicity). The Borg server has an "append-only" mode meaning the client can only add data to the backup and not remove it - this is useful because if an attacker were to gain access to the client, they can't delete all your backups. This is a common issue with other backup systems - the client has full access to the backup, so there's nothing stopping an attacker from erasing the client system plus all its backups.

For storing the backups, I have two storage VPSes - One with HostHatch in Los Angeles ($10/month for 10TB space) and one with Servarica in Montreal Canada (3.5GB space for $84/year).

Each system being backed up performs the backup twice - Once to each VPS. Borgbackup recommends this approach over only performing one backup then rsyncing it to a different server. The idea is that if one backup gets corrupted (or deleted by an attacker, etc), the other one should still be OK as it's entirely separate.