TS1741 when i plug in my ipad into my imac it will not update or do a backup it will not udate the apps on the imac

when i put my iphone and ipad into my imac it tells me they are already linked to another computer but i have imac now so i want to use this instead so how do i get round this, as if i backup now it delets everything.

- Transfer iTunes purchases:
iTunes Store: Transferring purchases from your iOS device or iPod to a computer
- Transfer other music by using a third-party program like one of those discussed here:
newer copy
- Or backup the iTunes library and restore to new computer by:
iTunes: Back up your iTunes library by copying to an external hard drive
- Connect the device to the computer and make a backup by right clicking on the device under Devices in iTunes and select Back Up
- Restore the device from that backup.
Note the backup that iTunes makes does not included synced media like alls and music.

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