I do backup every two days. To be safe and to transfer data from the iPad to the iPhone. About a week ago my backup was 3.1Mb. Recently I have noticed that the size went douwn to 2Mb. Having a new version installed, I thought that this is a new feature. But today I noticed that in an encrypted form I have missing data from a text field and the field is not writable. I have restored the previous (3.1Mb) backup and everything returned to the its place.
Use any third party iPad transfer software to backup the data on the iPad and store it an any user defined location. For more info visit
http://www.ipadfiletransfer.com