Throw a USB wifi module on it, and permanently mount it in your car. Then, at night, when it is in range of your home network, have it rsync your backups to it

Throw a USB wifi module on it, and permanently mount it in your car. Then, at night, when it is in range of your home network, have it rsync your backups to it from a primary backup server. I'm sure that the board itself is low power enough that it won't run down your car battery overnight, not sure about a USB hard drive though (or just configure the drive to auto spin down when not in use).