I signed up for the public beta programme as soon as it was announced, this will be the first time I've ever used a beta (public or otherwise). I'm planning on installing Yosemite on my 2011 MBP, simply because it isn't my main machine, but with it being a 2011 model i'm wondering if there will be many problems? also is backing up to Time Machine enough? I've seen people mention creating a separate partition to install Yosemite (again something I've never done before).