Gtetting a error when backing up quickbooks  that the data file is corupted.

Make a copy of the fodler that has the data file in it before doing any thing to it.

http://support.quickbooks.intuit.com/support/Articles/HOW12158
good link on reapring data file

http://www.sleeter.com/blog/2012/03/new-data-corruption-problem-in-quickbooks-enterprise-v12-costprice-update/
 article about auto update cpricing in version 2012

http://www.accountingweb.com/topic/quickbooks/repairing-corrupted-data-files-quickbooks
reapirng data file - creatig mobile file to resort and many other short cut tricks.  Also mentions how not to use a wirless netwrok with Quickbooks