You can use rEFIt it to boot multiple operating systems easily, including triple-boot setups with Boot Camp. Booting OS X from an USB drive is another useful option.In the case you aren’t using any other Operating System in parallel to OS X, rEFIt can still be useful to you for booting for instance from a 1:1 backup on a USB hard drive. Carbon Copy Cloner is probably one of the best tools to create a 1:1 backup of your system partition. Read more »
