It depends on what you mean by back up your data. If you're looking to back up your apps and user data, then use titanium backup.
Twrp is only for backing up your rom. Yeah it can back up apps as well and u can restore them but titanium backup is the best when it comes to this. I suggest titanium back up pro so u can batch restore and backup without any worries.
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| Scrolling Mods for Various OPO Roms
: Mahdi | Franco Kernel
Older devices: Nexus 5, Nexus 4, Galaxy Nexus, TF101, Nexus S, Samsung Vibrant, G1