Backup options display in different places for M5 and M40 instances. I think this is misleading and not consistent. Also, the form for backup restoring for M5 instances may easily lead to a catastrophe. That's because even when you explicitly enter a specific cluster, you can still select another cluster to restore to. Here is a video that I've recorded to explain my point of view:
https://www.loom.com/share/4d747b225c964af9809e0c8813a9b081