The thumbs.db is a system file which ensures that during an archiving process migRaven the empty directories are removed. Deleting empty directories is one of the essential functions of migRaven.24 / 7. Instead of: "Which prevents over during an archiving job migRaven the directories that are actually empty cannot be removed. Deleting empty directories is actually one of the essential functions of migRaven.24 / 7 "
The file has actually been superfluous since Windows Vista. Their use can be switched off via GPO. The deletion of directories is not possible because there is often a process on the files.
So that the archiving of migRaven running smoothly, use must be deactivated. Then you could delete the files on the entire file server. However, this is not absolutely necessary.