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But that limits you to one backup. You can make multiple backup image files and store them on one disk.

You can't right click on the partition and delete it? Hmm. It looks like it was set as a recovery partition.

Easeus has a partition manager, but i use Minitool.
https://www.partition-tool.com/...

You would use cloning to make an exact copy of one drive onto another. I wouldn't use cloning unless you are replacing or swapping out a drive. You should be using IMAGE backups. I don't use Easeus...