Calculated by adding up the number of files in all my Blockland/saves folders, dividing by 2 (for preview images), and multiplying by 90 bytes (the memory this phrase takes up), I have estimated that my computer contains at least 261.3 kB of "This is a Blockland save file. You probably shouldn't modify it cause you'll screw it up."
Now the question is, how the hell did I end up with 2,903 save files?