I have a drive connected to my MacBook Pro, and then a separate Powerbook on the same network. Both computers are running Leopard, and I want to configure Time Machine on the Powerbook to backup to the external drive connected to my other Mac. On my MBP I go to the external drive, right click, and click 'Shared Folder'. Then on the PB I can see the MBP on the network, and I can connect as Guest and browse the external drive, no problem. So it seems to be mounted. If I open Time Machine preferences, I am able to select the external drive as a backup. But when I try to initiate a backup, I get an error symbol and it says 'Backup failed' because 'Backup drive failed to mount'. The backup drive is clearly already mounted because I can browse to it on Finder. Any ideas? This situation is made slightly more complex because I did an initial backup by connecting directly to the drive over Firewire. I was hoping that it would just adopt that same drive over the network and continue to use those backups. But I don't really mind if it has to start again, and I have to leave it overnight to backup the first time. Right now, neither is working, over the network.