I'm out and on my phone, don't really want to watch a video to find out what command you ran. I assume it was a whole system backup like a nandroid.
Because you've now installed a different ROM, you only want to restore certain parts of your backup ie. You just want your user apps and data restored. If you restored your whole backup, you'd wipe Viper ROM and be back where you started.
Have a look at TitaniumBackup and Helium which will allow you to just backup and restore apps. I use Titanium and it has options to extract from a nandroid or adb backup.