How quickly do you need to be able to restore? Is it commercial or homelab?

The most cost-effective option by far would be to put a NAS device someplace offsite. You could use tailscale to connect to it remotely.

After that, depending on your access patterns, either a glacier-style s3 service (aws or backblaze/etc), or a rented bare-metal server with big disks some place inexpensive.

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.

Or to put it another way, why is state of the art important?