This needs more information. 5TB is far from "BIG" when it comes to cloud backups.

You can probably get away with google drive+rclone+borg/restic/whatever, but it will be rather clunky. Backblaze might be a nicer backend to use.

I use rsync.net with borg, but not sure about your budget. Their 1TB lifetime plan is very competitive though.

> Their 1TB lifetime plan is very competitive though.

I know rsync.net has been around for a long time but I'm always very skeptical of lifetime plans, you'd have to use it ~10 years for it to be worth it. (Comparing with Hetzner's 1TB storage box)