Recently I acquired a Macbook Air Mid 2011 model and I wanted to find a good backup regime. Since OS X has had a great backup software called Time Machine, which has been around since OS X 10.5 Leopard, I thought buying a Time Capsule would be the way to go. Unfortunately, due to budgetary constraints, I found that a 1TB Time Capsule that costs more than $300 a little bit of a stretch.
I went for a cheaper option and acquired the Seagate GoFlex Home 2TB drive for $100 less than the time capsule. When I took it home, though, the Time Machine could see the drive in the network, but did not want to backup to it, complaining about “The network backup disk does not support the required AFP features”. After persevering for a while, I went to search Google and found out in the Seagate forums that there was a firmware update for the drive, which I promptly downloaded through Preferences > Administration > Software Updates.
When the update was finished, I restarted the drive. I checked on the software version and I got version 2.5.3:184.108.40.2067:1.2.331. Then I went to create a new user through Preferences > Administration > Add User. As per the advice in the Seagate forum, I made sure that the user was not an admin user (do not click on the “Create As Administrator” checkbox in the GoFlex interface). I also ticked the Enable Computers Backup feature under Preferences > Administration > Computers Backup. I entered a password and then I restarted my MacBook Air and fired up Time Machine and Voila!
Time Machine is now working to backup my MacBook Air and it went on for 5 hours (my wifi is still on g, not n). I hope that someone will find this useful as I was getting a few gray hairs trying to make this work. I am not saying that this will work for everyone, but I hope it could be a starting point towards a solution.