In the new release of Mac OS X Leopard, Apple added a really cool program called Time Machine. Time machine was an automatic program that enabled you to back up your entire hard drive without you doing anything. This was great there was no need for manual backups. All you needed was a drive attached to your computer. But here lies a problem. Time Machine only works with drives that are supported. As a result network drives are no goes. But some clever sod, has found a way around this using a simple terminal command that allows you to use a network drive, also know as an unsupported drive.
To enable this option type the following into Terminal (Applications > Utilities > Terminal)
defaults write com.apple.systempreferences TMShowUnsupportedNetworkVolumes 1
You should now be able to access any drives on your network, such as a NAS (Network Attached Storage), as shown in the image below, the NAS drive by the way is the middle option.
Please remember that it is unsupported. So there could be bugs that might just wipe your entire backup. Use caution to see what happens. But as it stands it is great if you need a quick place to update. You do need a LAN connection, otherwise the backup could take a long time.