# Back up the Data Watcher MongoDB

To back up the Data Watcher database follow these steps:

1. On each node where Data Watcher is installed, stop Data Watcher (`dataone.sh stop DW`).
2. On each node where Data Watcher is installed, start MongoDB (`bin/mongodb start`).
3. On just one node of your choice among the ones where Data Watcher is installed, launch the `dwbackup.sh` script to backup the Data Watcher database.
4. On each node where Data Watcher is installed, start Data Watcher (`dataone.sh start DW`).

Need details about start and stop commands? Have a look at the [dataone.sh reference](/data-one-installation-manager/cli-and-configuration-files/dataone.sh-reference.md) page.

The script to back up the Data Watcher database is stored at this path:\
`$DATAWATCHER_HOME/mongodb/backup`

The `dwbackup.sh` script logs backup info into $MONGODB\_LOG\_DIR/dw-backup.log.

Usage:\
`./dwbackup.sh destination-path`\
`destination-path` is the folder where the backup will be generated and it must exist.

Under `destination-path`, the `dw-<datetime>/dw` folder will be created.\
In case the backup fails, the folder will not be created.


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