Love my desktop pc. Built it myself and I have a hard drive that is a secondary one that I ghost the operating drive onto so if the main one ever glitches, I simply put the backup one its place and continue like nothing ever happened.
That said, laptops are prone to dropping,cracking,breaking, don't take very well to being banged or bumped because everything inside is so crammed in there..
You do know you can can buy a flash drive large enough to hold your laptop hard drive contents and just use a GHOST program to copy your entire hard drive onto that USB thumb drive? Then you can simply boot to the thumb drive if you have to or your hard drive fails... You lost nothing then...