Hey All, I'm interested to know how everyone else deals with this situation. I have multiple macs, laptop, imac, and my wife has the same set up (business owners). We both have one hard drive per computer using time machine for back up. What do you all usually do when Apple comes out with a new OS, do you delete your current drive and re-use it? or do you hold on to it and buy a new one (incase for some reason you had to revert back to the previous version)? I'd think just erasing and re-using but i'm always nervous about doing that. What are you all doing?