As far as I know, on lollipop twrp can only backup encrypted partitions starting with version 3 dot something due to the design of the encryption Google choose. Will have to look it up where I read this. And yes, twrp backups are tar images
As far as I know, on lollipop twrp can only backup encrypted partitions starting with version 3 dot something due to the design of the encryption Google choose. Will have to look it up where I read this. And yes, twrp backups are tar images