Backup before updating to lion
Even if your machine is compatible with Yosemite, realize that not all features will work.
Handoff and Instant Hotspot will work with the 2012 or newer i Mac, Mac Book Air, Mac Book Pro, Mac Mini and the Late 2013 Mac Pro with an i OS device that has a Lightning connector and is running i OS 8.
Once you have taken your copy, upgrade your internal disk to Mavericks.Just click the Time Machine icon (the one that looks like a clock) to see when your last backup was completed. When you plug in any external hard drive for the first time, a pop-up will appear asking if you would like to use it for Time Machine.If you need to do another backup, just click on “Back Up Now.” If you are not backing up using Time Machine, let’s discuss the different methods of backing up your Mac using Time Machine. To set up your Air Port Time Capsule for backups, open up System Preferences and then click on “Time Machine.” Then click “Select Disk” and select your Time Capsule from the list that appears. Checking encrypt backup data will allow you to encrypt the Time Machine backup using File Fault 2. Doing so will give you an extra layer of protection by requiring a password to access the backup later, but encrypting the data can noticeably slow down the backup process.Don’t try to reboot your computer during this step.It will then restart itself and do another installation that takes about seven minutes.