I'm quite new to the whole Mac OS X and all of its services. I have my MacBook Pro now for about 3 months. What I wanted to do now is to setup automatic backups using the Time Machine. The situation is that I have an external HD with 320 GB of space. I'd like to partition that, since I'd like to reserve some partition for being used from Windows OS (for my other family members) and the other partition for doing the backups using Time Machine.
My question now is how much space you would (at least) reserve for your Time Machine backups? The system I'd like to back-up is my MacBook Pro notebook with a HD of 320 GB. Of course I cannot backup the whole (full) system (unless I use the 100% space of my ext. HD.
I just wanted to hear the opinion of some of you, who are already using Time Machine.