Verify Document Files
Determines if the blob exists for a document and if the document is accessible. If not, an error is logged for that document. The log message does not indicate why a file is missing or inaccessible. You can recover a file by restoring it from backup.
Possible scenarios for errors that would be logged:
If the file system on the network becomes corrupt, this option tells you which documents cannot be opened or which blob files are missing.
If someone marked a file as Read Only or Hidden, this option would log an error and list the file as inaccessible.