TIme Machine backing up an External Drive

a problem that is really vexing me
I had a 500gb ext hardrive for my itunes and then a 1TB harddrive for my time machine, both plugged in at all times, to my macbook
due to the iTunes drive getting full I got a new 1TB drive for that (not the same as Time Machine one as I need one that was USB powered for travelling purposes)
obvioulsy I moved to 2TB drive for time machine then
here is where the problem started, I was told my Time Machine the 2TB needed to be reformatted which was fair enough, so that is not MS-DOS extended (journaled) it immediately went about backing up my macbook straight away
but it did not touch my iTunes 1TB drive
I checked the option of "do not back up" in preferences and made sure the 1TB drive WAS NOT on the that list
then to no avail, for days now
it isn't being backed up
what is the mofo problem?
I did check 1TB drive and that is formatted as MS_DOS (Fat) - is that the issue, I assume time machine only backs up actual digital information
or does it not recognise that format?
please advise
a tired Ronan in Cork, Ireland

ronanfromcork wrote:
I did check 1TB drive and that is formatted as MS_DOS (Fat) - is that the issue
TM will not back up drives formatted for winsloth.

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