Partition or not to partition

daemon47

Registered
Need advice. I have 9.2.2 and 10.1.5 on seperate hard drives. I'm about to purchase a firewire external hard drive for backup. My question is should I back up my 10.1.5 hard drive completely and then reformat the drive before installing 10.2? Should I install 10.2 untop of 10.1.5, or partition my main drive with 10.1.5 on one partition and 10.2 on another. If I partition the hard drive for seperate operating systems, should I also create other partitions for various functions, iPhoto, Photoshop, etc.
 
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