It's not too complex.
Press the "backup" button to backup your Cydia apps, tweaks, and settings.
After this is completed, you MUST backup your iPad normally (using either iTunes or iCloud) to ensure your OpenBackup is saved away.
Then, if you ever need to restore your Cydia apps and tweaks, first fully restore your iPad backup, jailbreak, install OpenBackup, and press the "restore" button.
That's about all there is to it.