If by "wired" you mean downloading via iTunes with the iDevice connected to your Mac, then I believe you will retain a copy of the downloaded iOS on your Mac.
P.S.--If you have multiple same iDevices that you want to update, then this could be an advantage; the time to download on each is avoided.
There must be a simple or obvious answer to this but what passes for my brain can't work it out. I just did my iPhone iOS 7 update via iTunes and then repeated it for the iPad. Two gigabyte updates which put quite a dent in my download allocation.
Before I do the iOS 7.0.2 update (although this appears to be smaller), can you tell me how to get at the downloaded copy stored on the Mac from the first device so I can then update the other device without further impacting my limit?
