Reference: 
https://www.w3resource.com/mongodb/mongodb-backup-restore.php

"============  BACKUP  ==========="
Default
    Dumps all the databases into current directory
    D:\mongodb\bin>mongodump

Backup a Database with mongodump specify the --host and --port
    D:\mongodb\bin>mongodump --host 19.110.108.46  --port 27017
 
Backup a Database with mongodump specify different output directory
    D:\mongodb\bin>mongodump --out /backup_data/backup/

Backup of a specific collection and a specific database using mongodump
    D:\mongodb\bin>mongodump --collection userdetails --db myinfo

Create Backups from Non-Local mongod Instances
    mongodump --host [host name] --port 3017 --username [user] --password [pass] --out [backup folder path of local machine]
for example, the path of the folder  like :   /backup_data/backup/


"============  RESTORE  ==========="

Default
    D:\mongodb\bin>mongorestore

Restore Backups to Non-Local mongod Instances

    mongorestore --host [host name]:[port] [backup folder path of local machine]
    
    mongorestore --host [host name] --port 3017 --username [user] --password [password] [backup folder path of local machine]
for example, the path of the folder  like :   /backup_data/backup/

Dump from atlas URI

Anil-iMac:bin anil$ ./mongodump --uri "mongodb+srv://USER_NAME:PASSWORD@mongoatlaslitehrm.0cfre.gcp.mongodb.net/YOUR_DB_NAME?authSource=admin&replicaSet=atlas-m2x7xg-shard-0&readPreference=primary&appname=MongoDB%20Compass%20Community&ssl=true" --out /Users/anil/Development/Personal/mongodb-database-tools-macos-x86_64-100.1.1/bin/bkup