Why this thread isnt trashed (meaning deleted) by a mod is beyond me.
All threads like this is kept as a warning, just like car wrecks are left in the ditch for some time (some places), or tar-filled lungs are shown in 'stop smoking' campaigns...
In the hopes that some actually do read before they wipe their computer.
Heck, I knew Ubuntu would probably cope with a dual boot install by itself, but I still backed up everything and made sure I had the understanding I needed to before going into my first install. (wich worked flawlessly).
LMCE is an operating system... you don't install an operating system without backing up what you are afraid to lose.
And if you have ever had to reinstall windows you would know this...