Since copying multiple files is not an atomic operation, you must stop all writes to the mongod before copying the files. Without journaling enabled, there is no guarantee that the snapshot will be consistent or valid. File system snapshots are an operating system volume manager feature, and are not specific to MongoDB. This allows the corresponding mongorestore operation to replay the captured oplog. To get a consistent snapshot of a sharded cluster , you must disable the balancer and capture a snapshot from every shard as well as a config server at approximately the same moment in time. By default, mongodump does not capture the contents of the local database. MongoDB Cloud Manager creates snapshots of your data at set intervals, and can also offer point-in-time recovery of MongoDB replica sets and sharded clusters. Atlas continuous backups allow you to restore from stored snapshots or from a selected point in time within the last 24 hours. To get a correct snapshot of a running mongod process, you must have journaling enabled and the journal must reside on the same logical volume as the other MongoDB data files.
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