Still Need to Prepare for the OS X El Capitan Upgrade
It is a mistake to jump right into the OS X El Capitan upgrade if you have not done any preparation.
Use this list of things to do before you install OS X El Capitan to get your computer ready for the upgrade.
Spending 15 to 30 minutes preparing your Mac for the upgrade will keep your files, photos and work safe. Don't chance it, as we've already seen a number of OS X El Capitan problems.