Smile Backup and Restore

Question.. I went to restore a backup I made on my unlocked bl moto in TWRP. After a couple minutes it said FAILED. I tried a different backup that FAILED. I went ahead and booted. I was still running same rom, and all custom apps I had installed as system were there. I just list all my data. Anyone know why? I have a nexus 7 and HTC one; they restore just fine. First time I restored on my moto x. Thanks anyone that may of had similar occurrence.