HT1451 why does my library continue to disapear and must be re-downloaded from my back-up

why does my library disapear every time I close the file. When I re-enter Itunes library it makes me reload my library from a back-up file. Then I end-up with duplicates.

Clone your system.
Never apply updates w/o one.
And yes there is a page with all the Apple Downloads to do manually and then you can keep it on hand. Same for the OS X Lion or ML installer - save them before running. Still on 10.6.8 so you have OS X 10.6 DVD.
Combo updates do not do any harm. There could be issues to the drive directory beforehand.
Mac Pro has been shipping with Lion since summer 2011, though you can even now still reinstall iwth 10.6.4+

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