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It should also be added here that while gamesaves are in the 'crushed' (== compressed) state it is impossible to load those gamesaves when playing the games. The gamesaves can only be loaded in a game after being 'uncrushed' to their original size again.
Originally Posted by djflexmaster79
It is by far more convenient to use proper gamesave backup methods instead, to backup gamesaves to other media (like USB drives) using the psuPaste command of uLaunchELF. This method also frees up much more MC space than any compression can do, since the gamesaves backed up to ".psu" files on other media can then be completely erased from the MC, until they are needed for those games again (at which time you use uLaunchELF to restore those gamesaves to MC from their backed up ".psu" files).
Best regards: dlanor