Boot into TWRP and backup. Then you can play to your heart's content without worrying. [emoji14] As it's holidays I have more time to test things on Nexus 4, so after testing I recommend Pure Nexus to every Chroma fan(seriously they are fking identical - I was shocked)
Sent from my Nexus 4
I've tried the last build it was good but had some bugs, so waiting for the fixes that dragos mentioned will be there in upcoming release for camera and tethering .. etc
i don't say that N isn't that good, but you know we need stability to make sure that we can use our beloved nexus 4 without issues.