All you had to do was connect the drive up to a PC running Windows (Networking), map it to drive letter on each respective PC and back it up to it. That fact you tried to back stuff up with Memeo on a local network shows you don't know what it does.
What you need is a clear plan on what you want to do. Like a lot of people who buy computer hardware you just happen to see it at the store and bought it only vaguely aware of what you were going to do with it when you got it home.
If you truly plan on using it for backup, you're going to do some serious thinking rather looking for "There's an app for that" commercial.
This is why systems administrators get pay VbigV (not really
) money. Windows has rudimentary backup solutions and (obviously) networking. Just figure out what you want to backup, how often to backup, when you want to run backup and where you want the backup to be (where on the network is the backup drive going to be, etc.).