I made a personal app for myself to use with my business. Basically it allowed me to save check amounts, check numbers and clients who I got them from. This allows me to save all that info when I go to the bank and only have to enter it into my computer 1 time a month for my business since I hate book keeping. ios 5.1 wiped out all of my own personal apps which is not a problem. But it wiped out all the saved data that I had so I don't know what checks I have received now from clients! That sucked! iTunes / Apple should have found a way to back up my personal apps as well. The $99 I pay should ensure any updates I install should not wipe out any data from any apps I created and use.