I have lost all my itunes data due to a cumputer crash how do i sync my iphone and ipad to itunes without starting all over agian

Hi, I have lost all data from itunes on my computer, is there a way to re-sync or get all the data from my phone and ipad 2 back to itunes on the computer as when I go to sync message appears saying this phone is sync to a different itunes library and it will clear my phone if i continue. can any one help please?

These devices will sync with one computer at a time.  When you sync to a new one, then it will erase the current content and replace with content from the new computer.
It has always been very basic to always maintain a backup copy of your computer files/docs/pics/music/etc.
Use your backup copy of your old computer to move everything over.
If for some reason you have failed to maintain a backup copy ( not good), then you can transfer itunes purchases from your devices.  Without syncing:  File>Transfer Purchases
You will need to enter at least one unique contact and calendar entry on the new computer as well, otherwise that content will be erased as well.  If you have a unique entry, then you should get the option to merge the data.
Hopefully you have your backup copy of your old computer and will not have to go through this.

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