[AC Question]

. Here we are talkig only about clean. I want to dump memory content
I want to save image from app system cache

[Rukbat]

1. No. 2. The data won't make sense to anything but the app that saved it - including where it's located, which you can't control when restoring.

If you want to save the image of the phone, use TWRP. You can't save the image of a single app. (I don't think you can do that on any microcomputer.)