Backup Learnings
1. I have been diligent backing up all files from one external drive to another. But the backup software settings (FBackup) for the vid files were set to 'default" which means when they backed up the DVD video files they overlooked the .info and .bup files that are necessary to make the DVDs playable. There are also some older non-std video files that they failed to backup. So pay attention to the backup software settings. I use WinMerge, a free Windows software to do file by file bit (byte??) comparisons of the first initial backup to validate will check once a month