Now that you finished Part 4 - Restoring Rclone and Plexdrive configuration , all that is needed is restore the Plex database - and you won't even notice your server has changed.
You have prepared your backup script in Part 1 - How to restore your VPS in minutes , and your two backups (Plex database and VPS settings) are safely stored in the (Google) cloud.
If you are anything like me, you like to play with your VPS. Perhaps you like to reinstall it occasionally, or change to a new provider, or repair a corrupted server. I personally reinstall my VPS so often, that I can follow the guide almost blindly and be back to the original state in less than an hour.