The MacBooks are quite easy to change both the HDD and the RAM on, If its a MBP unibody it seems to be equally easy just a bit more complicated ooking because you need to take the bottom off and expose the workings to the world. Make sure you grab a radiator just before to earth yourself.
Backing up I'm not sure about but i think that if you do a time machine backup onto an external hard drive then you should be able to reboot from that. Im sure someone will clarify that.
The MacBooks are quite easy to change both the HDD and the RAM on, If its a MBP unibody it seems to be equally easy just a bit more complicated ooking because you need to take the bottom off and expose the workings to the world. Make sure you grab a radiator just before to earth yourself.
http://www.macinstruct.com/node/130 tells you how to do both. Google is your friend on this one.
Backing up I'm not sure about but i think that if you do a time machine backup onto an external hard drive then you should be able to reboot from that. Im sure someone will clarify that.