How to save pictures to iCloud?

I have lots of pictures that I took on my iPhone and then I uploaded them onto my Mac. Once they were uploaded onto my computer, I deleted them off my phone to make space. So if anything were to happen to my computer, all my pictures would be safe up in iCloud, right? How would I save them to the cloud from my computer? Or how do I know if they're already saved there?

Its a lot safer and easier just to save them onto a blank cd or dvd disk, or even a usb flash memory card

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