Unable to backup files with long names in Windows 8 using 'File History'

While trying to save copies of files for backup, I tried using 'File History' in 'Control Panel>>Security'.

I noticed that some of the files did not backup and are missing. On looking into it, it seems to happening with files with a longer file name but these are not more than the permissible 260 chars.

Is this a bug? How do I take backup?


File History is adding 25 characters to the file name for date and time of the version, thus the total length is exceeding permits.

This seems to be a bug.