Internal filesystem layout

At some point I’m likely to shuck the HDD out of the MCH and put it inside a real NAS.

Does anybody know how the data is stored by default? Is the partition layout sane with standard filesystems (eg EXT4)? I’m hoping to not need to copy everything off it, format, then copy back.

Well, yeah, it’s a standard filesystem (EXT4) but the partition layout is likely to be something other than what your “real NAS” expects it to be.