Does the Back Up from Camera Roll change?

I did a Back Up of 2000 photos from my phone. It is now a FOLDER in My Cloud Home. So now I want to delete all the photos on my phone. If I delete all the photos on my iPhone, will the Back Up Folder in My Cloud become what is on my phone or will the original photos remain?
I’m still learning how this all fits together…obviously!

Do you have a My Cloud or My Cloud Home device? They are not the same. The My Cloud Home has different settings and features than the My Cloud line has. If you have a My Cloud Home device see the dedicated subforum for that device where users more familiar with that device may be able to assist with your issue/question.

Yes! Thanks! I found the answer. It’s a back up not a sync! Thank you.