Do you have the original dvd discs or not?
If yes : get rid of those stupid backups on that harddisk and make new backups with ripit4me, dvd decrypter and dvd shrink. Saves a lot of trouble and it's free.
If no: get rid of those stupid backups on that harddisk, they're not yours
I can convert the HD copies to disk and then remove them from the HD, thus giving me the original and the fair-use backup.
Making a backup of a converted dvd while persumably having the original could work. I don't know if fair use is supported in your country.
As for research, I have often tried to do it and sometimes I find what I need but often can not understand what I find since I'm an not the most computer literate person around.