Space could be wider if one takes sd cart as a storage place.
Since it is just a matter of mounting file system, I assume it
to be not too difficult to format the card to have ext2/3 first.
Then to mount it to some place on the file system. Latter, all
new binaries or whatever could be put there with simlinks on
the device flash.
However, I'd rather have rsync to manage directories.
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