Seagate 500GB eSATA External Hard Disk
 

External hard disks are useful little items. If you like the idea of
backing up large chunks of data from multiple computers, having a large
capacity hard disk that you can carry around with you is a great
solution. Despite the fact that I think NAS appliances are the best
option for external storage in most cases, a plug-in external hard disk
is a far easier solution for the novice, and you can transport it
between locations