I haven't reloaded my iMac since they switched to Intel chips years ago. I've had several iMacs since then, but I've always just migrated over.
Over the last few years, my organizational skills decreased and now I have a small mess.
I'm going to reload the iMac next week.
My plan is to make a Super Duper AND a Carbon Copy Cloner on to 2 different external hard drives that I have laying around. Yes, I know it's redundant, but I don't want to lose anything.