IPad iOS 4.2.1 Upgrade?  I sync to multiple computers...

My iPad is supplied by my employer, whose office is in another state where I very rarely visit. My applications are loaded at that office. I manually sync media here at home on my MacBook Pro. I would like to upgrade to 4.2.1 here at my home but I am worried this might erase my applications. Anyone know what I should expect? Thanks in advance...

From reading the following it appears that the apps themselves are not in the backup. Specifically it says it backs up:
Application settings, preferences, and data
App Store Application data (except the Application itself, its tmp and Caches folder).
http://support.apple.com/kb/HT4079

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