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Example: Let's take things from the creative and then write /kill ourselves
We write the command /backinv list Player913 to get a list of your deaths.
We write the command /backinv load Player913 1, then the player is overwritten (all NBT data from the backup is applied) and the player (in our case, Player913) is kicked from the server to ensure that all NBT data works correctly.

Creates backup copies of players' inventories before death, which can be loaded using a command.