Advice needed regarding best practice

Hi - curious as to if what i have setup now should be changed to best utilize Time Machine. I have iMac with 750GB drive (a small chunk is partitioned for Vista) - lets assume I have 600 GB dedicated for the mac.
I havetwo firewire external drives - a 160GB and a 300GB.
Currently, I have my itunes library on the 300GB drive as well as a few FCE files. I have made the 160GB the Time Machine drive. Would I be better off moving my iTunes library to the internal HD and then using the 300GB drive as the Time Machine drive? As I have it now, I don't think my iTunes library is getting backed up. In an ideal situation, is it safe to assume your Time MAchine disk should be at leasta s large if not larger than the internal HD? Thanks.
Steve

Steve,
I would recommend using a drive that is 2x the size of the files you are going to back up. This is specifcally in the event that you make changes to the files and Time Machine starts backing up the new files that you have created. It will back up once every hour and it will only make a back-up copy of files that you have modified. If you are backing up your home folder, and you are using FCE, I would say back up to the 160Gb drive would be sufficient. If you were planning on backing up your home folder & your iTunes library, I would recommend the 300Gb drive. The only reason that you would need a backup drive 2x the size of your HD is if you were backing up your entire drive.

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