[Q] backing up failed??! topic

hey, so today i rooted my galaxy note 3 (n9005) using the cfire auto method. i installed cwm recovery on the device and tried creating a nandroid backup. it all goes fine until it says backing up /data then it fails. it does NOT generate a md5 sum file. so i want to ask if the backup i have is OK to use for future restoring or should i do something else. I really dont care about my downloaded apps, when i restore, i just want a stock device.
thanks.