Ah, in Backup. OK, many thanks.
I was about to add the standard apology for noob ignorance, @TMroy. But after some thought and a degree of trepidation (because I respect this forum and am very grateful for your help here) I'm going to finger-wag instead.
Snapshots can be backed up, which is an ideal combination. But you emphasise elsewhere -- absolutely rightly -- that snapshots aren't backups. A warning in the Backup Notes reminds us of the danger. The only possible conclusion is that file system snapshotting DOESN'T BELONG IN AN APP NAMED BACKUP.
Please escalate this to the devs. It should, of course, be in Snapshot.