FR: 'Backup and shutdown' option

[thibaultmol]

I have my backups scheduled at 2 am ish.
Sometimes I leave my pc on during the night. But often I do want to shut it down.
Having an option to back up and then shut down automatically (as some other backup programs can do) would be nice.
Could be just a menu option when rightclicking on the taskbar icon.

(Also, not sure with the upcoming refactor if it would then try to 'catchup' with the backup it 'missed' at 2 am. even though It did one already for that evening)