[electroly]

Primarily it's the reason you already know: restic and borg are the same model, but restic doesn't need it to be an ssh-accessible filesystem on the remote end. Restic can send backups almost anywhere, including object storage like your Backblaze B2 (that's what I use with restic, too). I agree with OP: restic is strictly better. There's no reason to use borg today; restic is a superset of its functionality.

[setopt]

Thanks! Then I’ll look more at Restic :)

[stogot]

Does restic work well with truenas?

[electroly]

I don't know specifically, but it's a self-contained single file Go executable. It doesn't need much from a Linux system beyond its kernel. Chances are good that it'll work.