Will reinstalling Lion via the Lion recovery partition cause you to loose all of your applications, documents, etc or does it just replace the Lion operating system and leave everything else untouched?

Will reinstalling Lion via the Lion recovery partition cause you to loose all of your applications, documents, etc or does it just replace the Lion operating system and leave everything else untouched?

The latter. I cant tell you how many times I've reinstalled lion! all your apps will be fine!
Things that will change are system graphics if you altered them with something like candybar or did it manually.
Having said that, you should always backup your stuff with time machine incase something does happen.
This is a very important step which will insure the safety of your files while doing things like updating or installing the OS.
Please exercise caution when doing things with a Hard Drive.

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