hi i recently updated from twrp 2.7.1 to 3.0.0 twrp recovery on my xt1022. although i am getting some new options in this version when trying to make nandroid backup.
i am getting these partitions option :
system
data
cache
boot
firmware
efs
i know about all the partitions except firmware. what is that partition there for? should i take its backup too with a normal recovery ? whats its function? also the data partition is very big than before. does it take backup of all the app data on external sd too?
please help 
any help would be appreciated