I similarly have a Pi in a cupboard doing the backups. In my case though, it uses wake-on-lan to wake the computers up in the middle of the night to run the bac

I similarly have a Pi in a cupboard doing the backups. In my case though, it uses wake-on-lan to wake the computers up in the middle of the night to run the backups, then lets them go back to sleep after. I use rsnapshot to a encrypted external usb disk.