[sciurius]

I've added the file size to the output after each file (i.e. MyFile.pdf (456 KB).

Are we talking about the "Select song to use" dialog? It already displays a.o. the creation date. The file size in bytes would give another clue which of the alternatieves would be the one to use.

As far as the backup file issue,

Note that I take full responsibility for what happens to me, since I persist in using a non-preferrred directory layout.

Basically, all my files are in folders named after the collection, on the SD card, outside of MSPro. MSPro is set to not copy the songs, so they are retained in their original locations.

  /storage/ABCD-0123/Partituren/Collection1/Song1.cho
  /storage/ABCD-0123/Partituren/Collection1/Song2.cho
  /storage/ABCD-0123/Partituren/Collection2/Song1.cho
  /storage/ABCD-0123/Partituren/Collection2/Song3.cho
  ...

There are several songs with identical names in different collections.

I make a backup and relocate the folder names. In the new backup the locations become:

  /storage/3210-DCBA/Partituren/Collection1/Song1.cho
  /storage/3210-DCBA/Partituren/Collection1/Song2.cho
  /storage/3210-DCBA/Partituren/Collection2/Song1.cho
  /storage/3210-DCBA/Partituren/Collection2/Song3.cho
  ...

The folder /storage/3210-DCBA/Partituren/ exists on the target device.
However, when I restore this backup, the songs are restored as:

   [MSPro Storage location]/Song1/Song1.cho
   [MSPro Storage location]/Song2/Song2.cho
   [MSPro Storage location]/Song3/Song3.cho
   
or

   [MSPro Storage location]/Song1.cho
   [MSPro Storage location]/Song2.cho
   [MSPro Storage location]/Song3.cho

even though I select "restore to original file locations".

When I relocate to /storage/3210-DCBA/Android/data/com.zubersoft.mobilesheetspro/files/Partituren/Collection1/Song1.cho it works.

As far as the merge collapsing the files into one, that should have only happened if for some reason it couldn't use and recreate the original subdirectories. I'll have to see if I can reproduce what you are seeing.

It could be a subtile permissions issue. Don't bother too much.