Does it last forever?

So my main concern is this: I duplicate pages, important ones, render changes, publish them and at some point I need to remove the plugin. Do the pages go with the plugin?
because right now my web page is showing images that no longer live in my media library – which makes me think the plugin is storing them somehow.
Please advise if anyone knows.
Thanks.

https://ww.wp.xz.cn/plugins/duplicate-post/