TiBu don't ever do system data. Its a surefire way to get frustrated. I always backup user apps and data. Some people just do the apps. You have to see which works best for you. I have a schedule set in TiBu that does my apps, then any new apps and another for any changes I've made to any. I only tell you those so you have am idea of what it can do. Once Liquid is flashed and up then you can go into TiBu and restore user apps and data or just user apps. Some people occasionally have problems restoring data. I haven't run into that yet.
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