I am a mature age university student using a late 2010 Macbook Pro 15inch which i have had since new. I was considering updating from Snow Leopard to Mavericks during my semester break however am not sure if in doing so i would lose my other applications i have on the hard drive. As i am not very knowledgable about these things i would like advice before i do anything to lose either my data or third party applications. I use time machine to do back ups and CCCloner to do a weekly clone to ensure i do not lose my work. All assistance would be appreciated.