I'm getting ready for the release of ML and wondered if it was possible to install ML onto a second partition just in case there are some big issues with ML/software compatibility. I currently have around 300Gb free on my primary disk and will create a secondary partition to install ML and copy over all my important documents rather than doing an upgrade or copying everything to an external disk. Once I've installed (and happy with the performance!) can I just wipe my Lion partition and join the two partitions back together? Does this sound feasible? If SHTF at least I will have OS to fall back on to!