Backup before updating to lion
In testing and with other user reports, OS X El Capitan 10.11 seems to run at least as well if not better than OS X Yosemite 10.10.5, so if you’re running Yosemite it’s certainly a worthwhile update.If the Mac is running OS X Mavericks, OS X Mountain Lion, or even Mac OS X Snow Leopard, you’ve got a tougher decision to make, mostly because you likely stayed on one of those earlier releases for a reason.Smaller developers tend to do this faster than larger software companies, so if you’re waiting for a large company it may take a long time.This is probably the most important step when upgrading any OS and a Mac is no different.If you are already using Time Machine, it is really easy to double check to see when your data was last backed up and to force Time Machine to do another backup if needed.
Many already have the beta version, which allows them to use and test the interface before its full release.
It will tell you what type of Mac you have, the screen size, the year it was purchased, and whether you are currently covered under Apple Care.
If your machine is supported by Mavericks, it is recommended that you have a backup of your data before updating.
A good list of compatible and incompatible apps is maintained in a searchable database by Roaring Apps, check it out here.
If you find apps that are incompatible with OS X 10.8 you can either find an alternative on the App Store, or consider holding off on the system upgrade until the developer gets their act together.