Hot Backup

Percona Server for MongoDB includes an integrated open-source hot backup system for the default WiredTiger and alternative MongoRocks storage engine. It creates a physical data backup on a running server without notable performance and operating degradation.

To take a hot backup of the database in your current dbpath, run the createBackup command as administrator on the admin database and specify the backup directory.

> use admin
switched to db admin
> db.runCommand({createBackup: 1, backupDir: "/my/backup/data/path"})
{ "ok" : 1 }

If the backup was successful, you should receive an { "ok" : 1 } object. If there was an error, you will receive a failing ok status with the error message, for example:

> db.runCommand({createBackup: 1, backupDir: ""})
{ "ok" : 0, "errmsg" : "Destination path must be absolute" }


Restoring data from the backup

To restore your backup, you need to stop the mongod service, clean the data directory and then copy the files from the backup directory to your data directory. Finally, start the mongod service again.

$ # Stopping the mongod service
$ service mongod stop
$ # Clean the data directory (assuming /var/lib/mongodb/)
$ rm -rf /var/lib/mongodb/*
$ # Copy the files from the backup directory to the data directory
$ cp --recursive /my/backup/data/path /var/lib/mongodb/
$ # Starting the mongod service
$ service mongod start

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