Hi All, First post, so please be gentle. I have been the proud owner of a Macbook Pro 2.5Ghz with 4GB RAM, running Leopard 10.5.6 for just under a year and I have never been able to get Time Machine to backup my files properly. Instead I have been backing up my really important files manually to an external NAS drive. However, I would like to back up all files to an external USB drive using Time Machine. I have a Freecom USB2 drive which I purposely bought, but when I try to perform the initial back up I get a message telling me there isn't enough space. My MacBook has a 250Gb HDD and my USB drive is 500Gb (465Gb available), so I have no idea why I am getting this message. I have ensured that no other devices are connected in case it was also trying to back up those (USB & NAS drive), but still get the same message. It says I need 698Gb of space to perform the full backup - where is it getting this from?! Within the options it shows me a panel containing an entry 'Time Machine Backups' with a size of 154.4Mb, which I'm guessing is the directory that I am trying to save the backups to. I'm probably doing something obviously stupid but would appreciate it if somebody could point it out for me. Any help would be greatly appreciated.