Default EFS Question

I restored a back up today using TWRP recovery and I had EFS checked although I should have had it unchecked because there's nothing wrong with my EFS. Everything works but my question is this;
Does the information in that folder ever change on its own? I would assume that it's read only and it doesn't change

Samsung Galaxy SIV
Graviton Rom
AusDim Kernel
ROM: CyanogenMod 10.1
Theme: AOCP ICEE
Kernel: AJK ONE
Modem: I777UCMD8