Backing up External drives to Time Machine - what happens if the drives are not connected at the same time?

I have 2 x 1 TB drive that I use interchangeably. 1 holds Video and the other Photos. I only have 1 connected when I'm working (using Premiere or Lightroom). I have a 2 TB NAS for making redundant copy of the other 2 drives.So far I've been doing the copying manually.
I'm considering of using Time Machine to make proper backup sets (though I'm always only interested in the latest set). I know that I can set Time Machine to backup to Nas over the network and include any external drives connected to the mac at the time.
The questions now are:
Will Time Machine fails if it can't find any of the external drives?
Does Time Machine handle backing up the external drives one at a time - only when it's connected - without thinking the files on the "missing" (or disconnected) volume had been deleted?
Thanks

Hi Ronald,
I can't answer the TM question, but Tri-Backup handles those situations perfectly...
http://www.tri-edre.com/english/tribackup.html

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