Mac users interested in Minecraft game backup for mac generally download:
TreasureChest is a small, simple, easy to use application that allows you to backup your Minecraft saves. Using this program, you can backup your save games on Mac OS X, restore your save from previous backups, restore your save game into another Worlds slot, repair corrupted save games and worlds with chunk errors, delete previous backups you don’t need anymore with a click.
Minecraft Jar Tool its a freeware tool for the most good knowed game Minecraft for patching and backup.
If you do mess up you Minecraft.jar file delete the files from ~/Library/Application Support/minecraft/bin/ and open the Minecraft.app up and they should redownload. And you should not lose your Minecraft saves
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Choose your patch, each patch file will be named 'minecraft.jar.patch'.
updated minecraft without a backup?...older minecraft versions? Use Minecraft
