Can two HDs be backed up to the external using Time Machine

Here is my situation: I am using a MBP with the standard 160 GB HD. I am sure glad I went for the 160 GB instead of the "faster" 100 GB option because I'm down to just 15 GB now!
One huge file is my iPhoto 08 library, which has about 35 GB of photos in it - way over 20,000 photos and video clips from over 20 years now.
I want to use Time Machine to keep backups of it, but it really does take up a lot of MBP space.
I also have a portable USB HD I bought for my recent trip. It has like 240 GB of space on it - plenty to handle the iPhoto 08 library. I think there is an option in iPhoto for specifying that the library be on an external disk, right?
What I was wondering, if I put the iPhoto 08 library on the external portable USB HD, would it still get backed up with Time Machine, as though it were on my MBP internal drive?
Thanks,
doug

Time Machine will back up external drives if they are formatted in Mac OS Extended or Mac OS Extended (Journaled). Most drives ship formatted FAT32. The directions in this article are for formatting a Time Machine drive but they do a good job of getting rid of the FAT32 formatting so they will work for your purposes as well. People with PPC Macs should substitute Apple Partition Map for GUID when following the directions.
You also may have to drag the drive you want to back up out of Time Machine's "Do not back up" pane which is in System Preferences > Time Machine under Options.
+I am sure glad I went for the 160 GB instead of the "faster" 100 GB option because I'm down to just 15 GB now!+
You're skating on very thin ice. Mac OS X likes about fifteen to twenty percent of free disk space to function properly. An overly full disk can cause some extremely nasty problems.
+One huge file is my iPhoto 08 library, which has about 35 GB of photos in it - way over 20,000 photos and video clips from over 20 years now.+
One backup is not adequate for this type of data that usually has a lot of sentimental or business value. It would be best if you kept two copies of the data on different hard drives using different back up software. It would also be a very good idea to burn all your files to DVD/CD as well. One copy of the backups should be stored offsite.

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