restore backup full content or just specific folders

If you only need to restore a specific plugin, then you could just restore that one folder.

The only extra item to be concerned about is any database changes made with the different version of plugin. You will want to check the plugin version in your backup and compare to the LIVE version in your site. Check the readme file for changes. if there are no database changes, then you are likely OK to restore just the files.

Most likely, when you restored Elementor, it had database changes too. For that software, it’s best to go to their Tools section and use their “Rollback” feature to restore a previous version as that will do both files & database changes for Elementor and Elementor Pro.