I was trying to export a file and copies of the file were created. I did not want that. I would like to restore back to before I made this mistake. Any ideas about how to do that?
If you mean that you exported and reimported into the same library, the easiest option in that case is just to sort your library by Date Added and delete all the recent items, and then empty the trash.
Upgrade Storage
https://www.zotero.org/support/sorting