Srry baltwo> am not as computer savy as you. With: "Restore your bootable backup/clone or Time Machine of your Lion installation and forego ML>" you are speaking Mandarin to a Canadian who does not parlez Mandarin. Can you try that in latman's terms please. Yes I do have an external HD that I use for backups It is not plugged in 24/7 but rather plugged in when I feel it needs backing up. "Restore my bootable backupclone or Time Machine"? That's Mandarin to me. Srry but thanks for the effort.
Computer operation 101.
Get a bootable, external HD (preferably FireWire, since it's 40-50% faster than USB 2 and designed for data transfers), make a bootable backup/clone before updating/upgrading, using something like Carbon Copy Cloner or SuperDuper!, and ensure that it's bootable and works like the original. That allows you to revert to the previous good state without having to reinstall or reset anything. See these for details:
If you only have a Time Machine backup, ensure that you can reliably restore it to another disk/volume/partition before updating/upgrading.
I Do have an External hard drive. And my 2009 Macbook does not have FireWire. I still use it with USB to Backup with Time Machine.
Honestly, I am not very knowledgable of computers including the Apple devices I own.
What I plan is to bring my Macbook into an iWorld Store and have them do the work. It's no different from a car in that there are things I know how to do and things I haven't yet learnt.
I work in the industrail world building mines, refineries and extraction plants etc. I never have to touch a computer. If I can follow instuctions to set up Time Machine and have the Backups saved to my 1tb External HD I can do more myself but prefer to have a pro do it for me to avoid screwups.
I absolutely Will do a backup IF I install the Mountain Lion. That is a Strong 'IF' at the moment. I Am copying tour suggestions though for a little later in the day. I do have a life with comittments to arrend to.