I use Restic and backup to rsync.net. The only reason why I use them is because they use ZFS and have a admin/user account system that allows for immutable snapshots once everything is set up.

Honestly though it doesn’t matter. The backups are encrypted outside of the PC you are using Restic on. You just need a drive or a PC with storage space and SSH access that you can access.

Just start with an external usb drive. You can pickup 8tb for under $200. If you want to go the extra step, you can buy two or three and physically swap them every N weeks. Store the older one at a different location.

Far less sophisticated than a real NAS, but also fewer moving pieces and things to go wrong.

My home nas and via zfs send the off site nas from my parents.

Local NAS and backblaze. It works well.