Does Time Machine require a dedicated external drive, or can it include other files?

After a misplaced library file, I'm having problems restoring some of the content on my MacBook Pro. I have a Time Machine backup on an external drive, but the drive also includes lots of other files that I want to exclude from the restore process. I'm concerned whether the Migration Assistant will scoop up everything on the drive.
The laptop is still running on Snow Leopard 10.6.8 for specific reasons (although I have Lion 10.7.5 on my iMac). I presume Time Machine and the Migration Assistant are the same on both operating systems -- but I'd better ask here first.
Thanks for any help with this question.

David Henderson7 wrote:
Another good idea. Thanks, FatMac!
For a long time, I was leery of putting too much stuff on one drive. It breaks, and you lose everything. But you're right -- the prices allow for even two 3TB externals that could manage backups of backups for paranoid types like me. And that's in addition to the internal drive.
Welcome to paranoidville. Staples has been selling Toshiba Canvio 3 TB externals for $120 and even though they must have green drives inside because they run a lot cooler than Seagates (of course they do, also, have ventilation), being fed from an SSD I've seen transfer rates of 130+MB/s connected to USB 3.0 ports. I have one set up with 4 partitions and maintain a rolling backup of the boot disk with BU dates recorded for each partition. A second Toshiba has a single periodic BU of the Mac Pro as well as a bootable backup of the rMBP and what passes for a Windows 8 backup of a Lenovo laptop. A third has the rMBP TM partition and a series of rMBP backups (that was originally used for testing and using the rMBP for a week without touching the rMBP SSD in case there was an image retention problem or some other issue, since the internal SSD can't be securely erased and I had 14 days to simply return it).
You can never be too rich, too thin or too backed up.

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