Can/Should you restore the `system` keyspaces in a Cassandra cluster? Taking this a step backwards, can/should you backup the `system` keyspaces in a Cassandra cluster?
Are there pros/cons to either approach?
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There is a narrow use case for taking backups of system keyspaces.
Yes, you should perform regular backups of the system keyspaces but you should only ever restore them in the event of a complete server failure.
In most cases, system keyspaces contain information about the local node. They are not relevant if you are cloning application data to another cluster.
For most situations, it would be quicker to build a server from scratch and replace a node with the replace_address flag (see Replacing a dead node) than it is to restore from backups but YMMV. Cheers!
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