Backup of replicas of a shard

[samene]

If I have replicas of a shard (like 3 shards x 2 replicas = 6 nodes) do I need to backup all 6 noodes and when restoring restore even the replicas of the shards? Or is it sufficient to just backup one replica of each shard ( 3 nodes) and then when restored the other replicas will sync with it?

[Slach]

How to make backup / restore sharded cluster

BACKUP

run only on the first replica for each shard

shard_number=$(clickhouse-client -q "SELECT getMacro('{shard}')")
clickhouse-backup create_remote shard${shard_number}-backup
clickhouse-backup delete local shard${shard_number}-backup

RESTORE

run on all replicas

shard_number=$(clickhouse-client -q "SELECT getMacro('{shard}')")
clickhouse-backup restore_remote --rm --schema shard${shard_number}-backup
clickhouse-backup delete local shard${shard_number}-backup

after it, run only on the first replica for each shard

shard_number=$(clickhouse-client -q "SELECT getMacro('{shard}')")
clickhouse-backup restore_remote --rm shard${shard_number}-backup
clickhouse-backup delete local shard${shard_number}-backup