As far as filesystem goes, it depends if your device is rooted or not. Assuming nonroot, you could use adb to list then download all packages. This would provid

As far as filesystem goes, it depends if your device is rooted or not. Assuming nonroot, you could use adb to list then download all packages. This would provide copies of most apps. In many cases, these can be decompiled with apktool. You could also use adb to pull other files, though not all, from the phone for inspection.