According to this question, Windows 8 File History silently fails when a filename is too long. How can I be certain that all of my files have been backed up successfully? Is there any way to be warned when a backup is unsuccessful?
Windows – Can Windows 8 File History be configured to warn you when a filename is too long
file-historywindows 8
Related Solutions
Or, you can use the old Backup that's actually still inside Windows 8
Although there's no guarantee it will still work on later version (9?).
I don't have any official evidences, but I did this with my backups.
Drawback: file history GUI will still show these deleted files as if they exist, but it will show error on trying to preview or restore them (so links kept in database until cleaned up by date).
If you have multiple versions of a file for different dates, you will still be able to restore it for dates, for which you didn't remove the file, but you'll have pick these specific dates in history GUI (using slider buttons at bottom of window).
Otherwise, it works fine.
Best Answer
You have to check it manually in event log under "Advanced Settings". Microsoft has just launched it, so there may be some bugs.
At the moment there is no automatic error report of back up failure (for example, if one of your folders is not backed up). You have to do it through event log.