fusecompress on knoppix-data.img?

[kl522]

I just wonder why special tools should be needed if the semantics in aufs2 is as advertised? If knoppix-data.img and ramdisk are both mounted read-write, shouldn't it be possible just to rsync ramdisk onto knoppix-data.img?

Aufs is more than just adding new files and modifying existing files. It is also able to "delete" or "hide" an existing files or directory. There is certain encoding or protocol to fully represent the modified file system structure. And therefore it is better to use the tools provided than to re-invent the wheel.