Create a single adb backup for each app /sd and inform of missing apks
...Other software is needed. The bundle is included in Android Backup Extractor, with the full README as well:
https://sourceforge.net/projects/adbextractor/
Collects EXIF information from image files (currently JPEG) recursively through a directory structure, and prints the information in histogram form (as numbers sorted by bin size). It uses the Exiv2 library to parse the files. C++ on Win32 and Linux.