Hi all Kindly help me in resolving this issue. I downloaded maverick update from app store and after its installation my mac is not booting. Since mine is a dual OS I have been working using my second boot that is windows. When I boot with the alt option i can now find there is one more drive seen which is recovery 10.9.2. How can I restore my previous version of mac(snow leopard) or how to back up my date . This is very critical for me kindly help.