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I am trying to synch my iphone but get a message that my backup is corrupt and I need to delete it before I can synch. I have a lot of new information in my iphone that has been added since my last synch. Will I lose everything in my iphone and have to start all over from the information last synched in my desktop?
iPhone 4S, iOS 6.0.1
Assuming there are no problems with the iPhone at the moment you should be able to use Edit > Preferences > Devices to delete the corrupt backup set, then backup your iPhone. No data should be lost. I'd recommend you restart your iPhone first to reduce the possiblity that something is going wrong at that end during the backup.
Note you should probably aim to backup your iPhone every week, or even more frequently. A year's worth of data is a lot to lose. It is also worth understanding that an iOS backup is a "rolling backup". Each time you update the backup it becomes a snapshot of the current state of the device (not including media which should be in your library). If you realise too late that you've lost some content from it you can't step back through earlier versions of the backup data. The way to create a permanent backup point that could be used again and again is to restore the device immediately after backing up.
tt2
If I delete the backup on my iphone will I lose everything entered over the past year since my last synch?
