Backing up and restoring data

Cassandra backs up data by taking a snapshot of all on-disk data files (SSTable files) stored in the data directory.

Warning: Always run nodetool cleanup before taking a snapshot for restore. Otherwise invalid replicas, that is replicas that have been superseded by new, valid replicas on newly added nodes can get copied to the target when they should not. This results in old data showing up on the target.

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