I have 5 TB backed up on BorgBase[1] and use Vorta[2] to add new data on desktops (macOS and Linux) and Dan's Borgmatic[3] on servers. (They all use Borg[4] in the background.)

This is a great setup because I get notified of failed backups and the data is compressed, encrypted and deduplicated before upload. So it's quite fast and efficient. I can also run it in append-only mode, so old backups are safe.

Since I'm involved with both projects, BorgBase and Vorta, please don't take my word for it and test it yourself ;-)

1: https://www.borgbase.com

2: https://vorta.borgbase.com

3: https://github.com/witten/borgmatic

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