I just bought a 500 GB internal hdd for my Macbook, and now I'd like to use Time Machine to make a backup of it on my external 500 GB hdd. I would like to save the complete content of my internal hdd, which is about 410 GB, but when I want to start the backup, Time Machine gives an error message saying that there would not be enough space, since it would need 520 GB. 
What's the reason for this discrepancy? I don't need to get files from last month or so, I would just like to always have a complete backup of the actual content of my drive. Shall I use another program?
Thanks for your help!
What's the reason for this discrepancy? I don't need to get files from last month or so, I would just like to always have a complete backup of the actual content of my drive. Shall I use another program?
Thanks for your help!