Edit: Tested again
This no longer works
If you go to the folder of a removed card, and open the folder.
You can Select all files in that folder and Mark them as
Read Only.
It will cause the iStripper App to have an Error when it tries to overwrite these Read Only Files
Thus preventing it from losing the existing files.
I have not tried this with recent versions, but have on prior versions a year or so ago.
It worked then, to prevent an Accidental update to cards I didn't want updated.
Best to Test it with a card that is Still in the Store 1st...
Use the Time and Date of the files to compare if they remain the same.
I'll test it again and report back my Findings...
Edit:
This no longer works