Why are certain apps not restoring to iPad after restore from backup. Are these apps gone and more importantly the data if they are not on my iTunes ?? Please say I can get them back

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Recently restored iPad 2 to factory settings. Prior to this did a back up unfortunately when restoring my back up certain apps did not restore and are not on my iTunes. I really needed the app data I know I can re-download the apps but the data was all my work and it's not on my back up files help!!!!
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thanks but it seems that when i did my backup it didnt save those apps so i have lost their content. ot may also be due to an update of my itunes as previous backups are also missing
just another great aspect of the ipad oh well i guees ill start from scratch...