My Time Capsule has been superseded; I realized that the fact that it contained a single non-user changeable disk didn’t make it the most appropriate backup location. The replacement is a ReadyNAS Duo, which contains a couple of 1TB Samsung Spin Points (HD103UJ) in a RAID1 configuration, and now has four Macs backing up to it. The setup, whilst not quite up to Apple standards was reassuringly simple – Time Machine is fully supported in the most recent firmware (although it could be made to work in older versions). I did look at the Synology DS-209, but it was considerably more expensive for no extra functionality, I also considered getting a Drobo, but the expense coupled with some very worrying reviews put me off, in the end the balance between price and functionality of the Duo and an extremely positive review from a colleague sold me. The biggest decision turned out to be what disks to buy; previously I have always purchased and always recommended Seagate, but they seem to have lost their way at the moment, suffering with some quality issues – hence the reason I passed on the free 500Gb Seagate ‘cuda on offer with my Duo and elected instead for the afore mentioned Samsungs.
My Time Capsule now serves as a rather expensive Airport Extreme.