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Message: <blockquote data-quote="harryb2448" data-source="post: 1629453" data-attributes="member: 42497">Well you can upgrade to Yosemite on your 2011 MBP.  What amount of memory is installed as most of us here agree 8GB is the go for Yosemite.  It is available from the App Store, a free 5.1GB download and you may like to burn an 8GB USB thumb drive with the system on before running the Installer.  Lion DiskMakerX will do it for you.Do you use an external drive for TM or cloned backups?  If so suggest after making the bootable thumb drive, boot from it by holding down 'C' after the shime with the drive connected, go to Utilities and format the drive,. install, and then use Migration Assistant in utilities to back up items from the external drive.</blockquote>