Just to get started, all you need is a 2GB Ubuntu instance that is $10/mo or pick rsync.net with zfs capability which gives you 1TB for $25/mo.
If you want easy fast backup, even hobbyist shouldn't overlook zfs.
Besides, Borg doesn't work with any cloud providers but only can go against ssh servers. You can also use Hetzner than rsync.net for this.
Restic and Borg are portable. You can send to, and recover from, any cloud provider for cheap.
There is rsync.net for ZFS, it requires minimum 1TB and it’s still more expensive than alternatives (because they have to assign to you RAM and some CPU too).
If you have a ZFS backup system, use that. Ordinary people might be better off with a tool that works with any cloud storage.