OS Upgrade
My sister has an older iMac and she has asked me to help her upgrade her OS. Unfortunately, I'm a Windows guy, so I don't have much experience with MAC OS upgrades.
She has Leopard currently installed (10.5.8) and as I understand it, I need to purchase Snow Leopard from the Apple store and after I get that installed, then I can upgrade to El Capitan (no charge).
1. Is this sequence correct?
2. Are there any problem areas that I need to be wary of while doing the upgrades (i.e. will she lose programs/data, do I need to backup her system prior to the upgrade, etc.)?
Thank you!