I have protect network files turned on for auto-import. However, this means that if I rename an album due to a correction, auto import will not fix this. Both copies will remain in the library.
Can this feature check to see if the parent drive is functioning? If the drive is functioning and available, then the files should be removed. It seems like protect network files basically breaks this feature completely.
In the past I just had the non protect network files mode and this seemed to function properly. However, I can't remember what happened if the drive was offline. That is the main concern: that if the server gets turned off, all auto import files would get removed.