I just have a quick question before I start my initial Time Machine backup of my MBP. I currently have a firewire external HD with a ~200GB HFS partition that I'd like to use for a Time Machine backup of my ~100GB HFS partition/OS X installation on my laptop. However, the external partition already has some other files on it that aren't stored anywhere else. My question is can I keep other files on the TM backup partition or does the entire thing need to be dedicated to the TM backups? I didn't want to risk losing the files already on the partition. Also, if it's possible to use the partition for other files, can I occasionally add new files to the ones already there outside of the TM backup? I'm guessing TM will allocate space as it's available without overwriting other files not part of the backup...please correct me if I'm wrong. Thanks.