Can I set Time Machine to backup both my hard drive and an external hard drive?

Hi. I've been working with a lot of family video lately and my internal hard drive has filled up significantly. iMovie doesn't seem to have a good archiving facility like Adobe InDesign which I use at work were all the relevant files are gathered together into one folder. Apple advised me to relocate my movie files to an external hard drive and herein lies my query.
Is there a way for me to set Time Machine to backup both my iMac's internal drive and the external hard drive that would contain my movie files? I've been using Time Machine for my backups for a few years now, but backing up the external as well has me stumped. If Time Machine could be used then all the necessary file accociations etc would be safely backed up as well - that's why I don't want to have to manually backup the external.
Anyone have any ideas? Thanks!

7string48 wrote:
Thanks so much Pondini!!  You just quickly answered a question that none of the Mac people in 3 stores or Apple Care have been able to answer.If you can format it HFS+ (any variation of Mac OS Extended), it will work.  If not, it won't.  
I'm not too surprised about the Apple Stores, as they don't get much training on Time Machine.  But AppleCare sure ought to know. 
Oh...what about if the external drive is an array...like a Drobo with it's own proprietary formatting...I guess that would not work...??
I've never used a Drobo.  A number of folks here have used them as their Time Machine drives, but I don't recall seeing anyone try to back one up with TM, so can't say for sure.  But if you can format it as HFS+ (any variation of Mac OS Extended), it will work.  If not, it won't.
At least part of the reason is, Time Machine uses the File System Event Store, a hidden log of changes that OSX keeps on each Mac-formatted disk/partition, to figure out what's changed and needs to be backed-up.  See How Time Machine works its Magic for details.
See Time Machine - Frequently Asked Question #32 for details and considerations of backing-up multiple volumes with Time Machine.
However, even if it will work, that may not be your best strategy, depending on your circumstances:
Since Time Machine keeps copies of things you've changed or deleted, the destination needs to be considerably larger than the data being backed-up.  How much larger varies widely depending on how you use your Mac, but a general "rule of thumb" is, it needs at least twice the space to be able to keep a reasonable "depth" of backups for you.
If you have a large internal HD, fairly full, plus a large external HD, and the files on the external don't change frequently, you might want to use Time Machine for the internal, and a different app to a different disk or partition, on a different schedule, for the external.  Especially if space is a consideration, you might not need to keep previous versions of files on the externals.  See Time Machine - Frequently Asked Question #27 for some alternatives.

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