[zinekeller]

Assuming that your NAS is Linux-based, maybe Borg with Rsync.net may suit you (used it for mine, satisfied with it). Note that you are responsible for keeping the Borg encryption keys if you used it. $80/month (for 10 TB) might be yikes though if you're expecting a web or mobile-browsable backup though (since Rsync.net is literally a ssh storage provider), and if you want to keep snapshots, you need to also pay for their storage. Borg supports FUSE access though, so if you really need to browse then that should be good enough for occasional one-off restores.

Borg: https://borgbackup.readthedocs.io/en/stable/

Rsync.net: https://www.rsync.net/products/borg.html