Can I back-up my computer with TM to multiple hard drives?

I have one internal hard drive I want to back-up using Time Machine. I also have two external hard drives. Can I use Time Machine to back-up my computer to both externals, or is Time Machine only capable of using one external HD for the back-ups?

TM can only have one backup drive at a time. you can switch TM drives in system preferences->TM and alternate backups between two drives. or you can use a different backup solution for your secondary backup. see this post for options
http://discussions.apple.com/thread.jspa?messageID=7495315#7495315

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