In this thread, it'd been requested to add the destination to the notification email for backups: https://virtualmin.com/node/34980
Seems reasonable. I've included a patch to implement it. I haven't tested it, though it looks simple enough that even I probably wouldn't screw it up.
If you don't have any objections to adding this behavior as the default,and doing it in the way I've done it, and don't want to mess with it, I can test it and commit it to git. (I guess it's theoretically possible people could have scripts out there that rely on the exact text coming back from the emailed report...but, that seems unlikely, since it's much more likely they'd be using the command ine API if they're using scripts for stuff like this.)