how can I create a backup of a sharded cluster mongodb?

I have 3 config serv,

• config01
• config02
• config03

2 shard with 3 replica

• shard01a
• shard01b
• shard01c
• shard02a
• shard02b
• shard02c
• shard03a
• shard03b
• shard03c

and main_db

How should i get backup with mongodump?

Best Regards