Does anyone here know how to make back-up copies of pre-recorded DVD's?

FunkyMonkee

I've got several TV series on DVD's that were made/sold by Warner Brothers and several of them are badly flawed. They'll play perfectly fine the first time or two but, after that, they'll at least do one of several things:
1. They skip and stutter and will take an hour or so to get through a very short section by playing only one frame every 2 or 3 minutes. When they finally DO get past the flaw, they've skipped over several minutes of the show and there's no way you can ever watch that bit again! In some cases, they'll do this shit on the very first play!
2. They refuse to play at all!
3. They'll play part way through and then the rest of the DVD is now BLANK!!
4. In one case, I bought a factory sealed copy of a 4 DVD set and there was only 3 of the 4 in the box! I contacted the company and said I JUST want the one missing DVD they neglected to put into the set. They refused to send it to me! (A multi-billion dollar company like that can't afford to send me a fucking DVD that only costs them 50c to make?) They already got my money for the set! The mistake was THEIRS, NOT MINE!! I'm not about to risk buying another copy and find THAT one is ALSO missing that disc! It was obviously intentional because, of the 4 sets of that series, that is the only one that could house ONLY 3 DVD's!
So, before I lose anymore of this material I paid all that money for, I wanna make copies so that, IF the rest of those discs go bad on me, I still have a copy either on blank DVD's and/or a hard drive/jump drive!!

Does anyone here know how to make back-up copies of pre-recorded DVD's?
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