Sdcardfs is a virtual file system in Android or some Linux systems. It is implemented using FUSE.
It is called Android's 'adopted storage', is used in virtual sdcards, or protected partition areas. (For example: /storage/simulated/0)
If you try to dump an sdcard file system (ex: /sdcard) by dd command, It is not dumpable. (It does not have sectors or anything.
So, if I try to dump the parent file system (ex: 'FUSE like vFAT' on EXT4), it is not recoverable by all of commercial file recovery software. Because sdcardfs is a virtual file system using FUSE, it is not stored like a file or agglomerate something(s).
How can I dump and recover an sdcardfs file system?