How to revert a do-release-upgrade?

Question

I can update my Ubuntu to the new LTS version. As you can think, its not a highly important server since I run 13.10 (not a LTS version). Anyway - I actually want to upgrade my server, but would like to be able to revert this upgrade.

I would be able to reinstall Ubuntu 13.10 and overwrite it with my backup. But I want to know if there is a more comfortable way to do this. TBH I guess theres no command as undo-release-upgrade but I thought it would be worth to ask for it.

This is my current daily backup script

tar cvpzf $backup_file --exclude=/proc --exclude=/lost+found --exclude=$backup_file --exclude=/mnt --exclude=/sys --exclude=/media --exclude=/tmp /

Solution

As Faheem said in comments, you can't revert/downgrade the version of Ubuntu once you upgrade it. The only possibility is to do an image of the system, or complete backup and then installing it over. You can also test in a VM as derobert suggest.