Since iOS 9.3.2 the idevicebackup2 tool has not been able to perform the 'unback' function as Apple removed the facility.
ideviceunback replaces this functionality
Currently in ALPHA development phase.
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Clone the project
$ git clone https://github.com/inflex/ideviceunback.git
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Build it
$ make
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Run it!
$ ./ideviceunback -h
...or...
$ ./ideviceunback -v -i path/to/backup -o output/path