I would like to install Mountain Lion when it comes out...

I have a late 2010 MBA 13 with 2GB of RAM and a 128GB SSD running OSX Snow Leopard. I'd like to install Mountain Lion when it comes out. I've heard that I must have OSX Lion first. I've always backed up my Mac using Time Machine to an external HDD, and the backups are current. My question is, I'd like a successful install of Lion, so that when ML comes out, I can buy and install that. My computer has two seperate user accounts, one for my wife and one for myself. We both use this computer and I don't want to mess any of her files, settings, etc up with either upgrade.
Would I be safe performing a backup, then buying Lion from the Mac App Store and installing it? What problems would I run into? When ML comes out, will that be an easy upgrade also?
Ryan

You actually DON'T need to have Lion installed in order to installed Mountain Lion. You can do it right from Snow Leopard.
But if you want to install Lion beforehand(which at this point I would just say to wait for ML), then yes, backup your Macintosh HD to an external hard drive or just use Time Machine, and that will back up both user accounts.

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    I'm not sure where you read that about the disk being "write-locked." That doesn't make much sense, given that the major task an installer like this must achieve is writing a whole bunch of files to the hard drive. I think your source was mistaken.
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