Follow up:
Server 2.5.9 beta now does delete most of the image files except “*.raw.bitmap”. When hitting “Delete now” from the GUI, an error message gets shown but no error is found in the logs.
Files successfully deleted when hitting “Delete now”:
*.raw
*.raw.cbitmap
*.raw.hash
*.raw.mbr
*.raw.sync
Remaining file:
*.raw.bitmap
Log when hitting “Delete now” for another time:
2020-06-19 20:01:08: Deleting image backup ( id=6, path=D:\Backup\client1[N]\200619-1928_Image_N\Image_N_200619-1928.raw ) …
2020-06-19 20:01:08: WARNING: Deleting D:\Backup\client1[N]\200619-1928_Image_N\Image_N_200619-1928.raw failed. Das System kann die angegebene Datei nicht finden. (code: 2)
2020-06-19 20:01:08: WARNING: Deleting D:\Backup\client1[N]\200619-1928_Image_N\Image_N_200619-1928.raw.hash failed. Das System kann die angegebene Datei nicht finden. (code: 2)
2020-06-19 20:01:08: WARNING: Deleting D:\Backup\client1[N]\200619-1928_Image_N\Image_N_200619-1928.raw.mbr failed. Das System kann die angegebene Datei nicht finden. (code: 2)
2020-06-19 20:01:08: WARNING: Deleting D:\Backup\client1[N]\200619-1928_Image_N\Image_N_200619-1928.raw.cbitmap failed. Das System kann die angegebene Datei nicht finden. (code: 2)
2020-06-19 20:01:08: WARNING: Deleting D:\Backup\client1[N]\200619-1928_Image_N\Image_N_200619-1928.raw.sync failed. Das System kann die angegebene Datei nicht finden. (code: 2)
2020-06-19 20:01:08: Deleting image backup failed.
Workaround: running ‘remove_unknown.bat’:
2020-06-19 20:04:17: Removing unknown for client “client1[N]”
2020-06-19 20:04:17: WARNING: Image backup [id=6 path=D:\Backup\client1[N]\200619-1928_Image_N\Image_N_200619-1928.raw clientname=client1[N]] does not exist. Deleting it from the database.