Default Restore TWRP Backup How?

How do you do a restore of a TWRP Backup of a ROM or the original Asus JB OS? I tried to restore the backup I did before flashing the CROMi-X ROM. When I try to do a restore in TWRP and goto the Micro SD Memory card I have the backup on it does not show any files. Do you have to use the same version of TWRP that you backed up in order to restore or can you use the same version or higher?