Exporting destructive changes to document safely

I have a cloud document which contains a lot of illustrations. They're drawn high res in this document and I need to be able to export them cropped, and at 25% of their actual size. (Keeping the high res version is important). Finally, I undo the changes after the export. 

How do I do this safely? I crop the document, then size it down to 25%, then export it, then undo. My fear is PS crashing and because it's a cloud document, auto saves the cropped document. A work around would be not using Cloud Documents, but I want to be able to access this document from various locations so it's easier this way. 

Can anyone suggest a means of safely cropping/resizing exports so I don't risk losing the high res images? (I could copy it to a new document, but because my computer hangs when loading new documents it's annoying, and I'm used to my method from when documents didn't auto save constantly. Option to not auto save cloud documents would have been nice here... Copying to new document is best practice in this scenario?)