MBL 2GB backup solution

WD Legacy Products My Book Live
2

infamous question of backup vs redundancy.

http://www.cnet.com/how-to/digital-storage-basics-part-3-backup-vs-redundancy/

MBL is my backup device.

Main file on laptop/PC/phone/tablet

Second copy on MBL

Third copy only for very important files on Dropbox

but you can make it anything you want, it all depends on your requirements and how complex/secure you want it.