I bought a Maxtor 'One Touch' just like in the picture above. It came with some backup software called 'retrospect' which seems pretty good (excellent help site, bulletin board etc)
If you upgrade this s/ware you get 3 clients which allows you to perform backups across your network though this depends on your network working well. It drops out mid backup usually on my wireless net and I've resorted to carrying the drive to each PC in turn.
Just upgraded to a 54g router though. and this might help.....we'll see.
I bought this to replace a Freecom drive which failed after 13 months so just outside the warranty period
so although it is anecdotal I would avoid that brand!