Hello there walshsemail,
Thanks for posting here on the Apple Support Communities! This is a place where other Apple users can submit questions or respond to others to help lend a hand. Let's take a closer look as we do our best to provide some additional insight.
We understand you're wanting to save DVD movies to your Mac so you can then also upload them to the iCloud as well. This is something that can be done, but you'll need to look into third-party applications that offer this ability.
There may be some you could look for in the Mac App Store. Use search terms like "DVD Ripper" or "DVD Converter". Then use the reviews and app descriptions to make the best choice for your needs. The App Store is a safe place to download apps that have been vetted by Apple in some way.
Download apps from the App Store on your Mac
Once you download the videos locally to your Mac, you can always import them into the Photos app and make any edits using iMovie:
Overview of importing photos and videos into Photos on Mac
iMovie Support
You may also want to consider creating a duplicate backup of all of these movies on an external hard drive or using Time Machine. In case something ever happens with your iCloud or computer, that secondary backup will always be there as a plan B.
Back up your Mac with Time Machine
We hope this helps get you pointed in the right direction.
Take care.