I have a client with a WHS 2011 box that they're using for backup. Three client PCs are backed up to the server. They've got two 1TB USB drives attached as Server Backup disks. They were installed at the same time and have both been hooked up for months. The intention was to keep one drive off-site for disaster recovery.
I've read many of the threads here about this. Managing this process looks like it might be actually easier for a non-techie. Once it's set up (like it is now) it seems you just unplug the drive you don't want and take it home. There's no Safely Remove Hardware icons to click or any worry about that, by design. Just unplug and play 
So is that what I can tell the client? Just unplug either drive and take it home. Next week take the other one home and bring the one from home back.
I could check in remotely the first week or two to check and make sure it's running smoothly. But for long term I need a procedure that's so easy your Grandma could do it!
Thanks!