Multiple iphones each with an apple id - can i use the same laptop and itunes for back up, restore and updates?

We have two iphones each with a different apple id - can i use the same laptop and itunes for back up, restore and updates without risking having my apps overwritten.  Basically does itunes keep the two iphones as two separate entities ?  Does iTunes differentiate between the two devices and keep two different SYNCs ?

Yes, you can use the same computer for BACK UPS, RESTORING AND UPDATING. But that is it.
You cannot, however, use it to sync the different devices. iTunes will only recognize one device to sync with and if you sync any other devices with that iTunes library, it will replace what is on the phone with whatever is in the library. It cannot differentiate between devices. At most, it will jsut recognize that the phone has been synced with a different iTunes library.
So if you would like to use the same computer for backing up, restoring and updating, just make sure to turn of Automatic Syncing in your iTunes Preferences.

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