I'd transfer it off now if your drive is clicking... the drive can die at any moment at this point and you may not be able to transfer it off later. Don't wait... back up your stuff while you are still able.
It gets backed up daily (sometimes more) at this point.
In all fairness it only clicks (packing heads) 20-60 minutes each day. My last final is on Thursday. After that it can tank, and I really don't care.
Just crossing my fingers that 6/6 is the day.