Adding an additional drive(s) to an existing Time Machine back up???

Say for instance, I have Time Machine running and at a later time want to add another hard drive(s) to increase my Mac's storage.

Can an additional drive(s) be added to the existing TM back up? Can TM then just start backing up the additional drive(s) too?

I hope this makes sense.

Sorry for the confusion. What I meant is, can I add an additional hard drive(s) to the main system(Mac) that's being backed up. Not to the (actual) Time Machine back up's drive.

Will the current Time Machine back up then be able to 'back up' the main system's newly added drive drive, without having to re-run the TM back up again.

Alrescha said:

Yes, Time Machine can back up multiple drives on your system. External drives are excluded by default, but you can change that in Time Machine preferences. Time Machine will just start backing up the new drives. Your Time Machine disk has to be big enough to back up everything.

A.

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Thanks, I just changed computers, from a G5 to a 2009 Mac Mini. I was running OS 10.4.11 on the G5 and was using the back up software(WD Anywhere Backup) that came with the Western Digital external hard drive.

I'm now running OS 10.6.8 on the Mac Mini and now have Time Machine. One of the issues with the Western Digital back up software, was that if an additional source drive was added the entire back up had to be stated over again.