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       nodetool snapshot - Take a snapshot of specified keyspaces or a snapshot
       of the specified table

       nodetool [(-h <host> | --host <host>)] [(-p <port> | --port <port>)]
               [(-pp | --print-port)] [(-pw <password> | --password <password>)]
               [(-pwf <passwordFilePath> | --password-file <passwordFilePath>)]
               [(-u <username> | --username <username>)] snapshot
               [(-cf <table> | --column-family <table> | --table <table>)]
               [(-kt <ktlist> | --kt-list <ktlist> | -kc <ktlist> | --kc.list <ktlist>)]
               [(-sf | --skip-flush)] [(-t <tag> | --tag <tag>)] [--] [<keyspaces...>]

       -cf <table>, --column-family <table>, --table <table>
           The table name (you must specify one and only one keyspace for using
           this option)

       -h <host>, --host <host>
           Node hostname or ip address

       -kt <ktlist>, --kt-list <ktlist>, -kc <ktlist>, --kc.list <ktlist>
           The list of Keyspace.table to take snapshot.(you must not specify
           only keyspace)

       -p <port>, --port <port>
           Remote jmx agent port number

       -pp, --print-port
           Operate in 4.0 mode with hosts disambiguated by port number

       -pw <password>, --password <password>
           Remote jmx agent password

       -pwf <passwordFilePath>, --password-file <passwordFilePath>
           Path to the JMX password file

       -sf, --skip-flush
           Do not flush memtables before snapshotting (snapshot will not
           contain unflushed data)

       -t <tag>, --tag <tag>
           The name of the snapshot

       -u <username>, --username <username>
           Remote jmx agent username

           This option can be used to separate command-line options from the
           list of argument, (useful when arguments might be mistaken for
           command-line options

           List of keyspaces. By default, all keyspaces

backup - simple

More here

nodetool snapshot -t snapshot-name keyspace

restore on the same node

nodetool refresh

clear snapshots | delete

nodetools clearsnapshots