time machine back up - slow computer - reinstallation of OS X

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Apr 21, 2008
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Hi there, my Imac has been running slow lately (got to do a lot of movies and pix) and i'm using 750Gb out of 900Gb. So i thought i would reinstall the OS.
#1: I have now backed up all files with time machine, can I access it when OS reinstal? or is it connected to that specific OS?
#2: is it at all worth reinstalling or just deleting what i can save alsewhere?
#3 can i reinstall while keeping some back up on the computer somehow? (partition?)

thanks a lot for advice!

Tubab'
 

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