What i want to do is erase all the data on my main internal HD and replace those files with the backup, so i backed up my files onto a partition on my external HD using SuperDuper! and went to use the installation disk to erase all my data off of my internal HD. But when i came to select where to install the OS from i couldnt select my external HD, it didnt even show, it just said 'searching for time machine backups' in the middle and my external HD didnt even show up. Now im not sure on this, but would i have to reformat my external HD then re-backup using time machine in order to do this? And im not too sure with time machine, would it backup my files then start using it as a time machine? or can i not use that feature and just backup my files using it? Hope someone can help me here Thanks .