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# Using the Stash Backup Client

This page describes using the Stash Backup Client, which has been supported from Stash 2.8 and is the backup strategy that Atlassian recommends for most people.

For information about other backup strategies for Stash, see Data recovery and backups. That page also discusses the tight coupling between the Stash file system on disk and the database that Stash uses.

With any strategy, you should consider scheduling the backup window so as to minimise the impact on Stash availability. You might consider checking the access logs to determine patterns of lowest usage to help with this.

We highly recommend that you establish a data recovery plan that is aligned with your company's policies.

Questions? Check out FAQ - Data recovery and backup.

Download the Stash Backup Client from the Atlassian Marketplace, or from here:

Unzip the client into a directory on the Stash server.

## How it works

The Backup Client implements a common and universal way to back up a Stash instance, and does the following:

1. Locks access to the Stash application, the repositories managed by Stash and the Stash database for the entire duration of the back up. This state is called 'maintenance mode'.
2. Checks that all Git and database operations have completed.
3. Performs an application-specific backup of the Stash home directory and the Stash database. The backup is generic and does not depend on the server or database configuration.
4. Stores the backup as a single tar file on the local filesystem in the specified location.
5. Unlocks Stash from maintenance mode.

A user will get an error message if they try to access the Stash web interface, or use the Stash hosting services, when Stash is in maintenance mode.

The client supports Windows and Linux platforms, and Stash versions 2.7 and higher, but does not provide ways to integrate with your organizations IT policies or processes.

As an indication of the unavailability time that can be expected when using the Stash Backup Client, in our testing and internal use we have seen downtimes for Stash of 7–8 minutes with repositories totalling 6 GB in size. For comparison, using Stash DIY Backup for the same repositories typically results in a downtime of less than a minute.

## What is backed up

The Backup Client backs up all the following data:

• the database Stash is connected to (either the internal or external DB)
• managed Git repositories
• the Stash audit logs
• installed plugins and their data

The backup does NOT include the following files and directories:

• export/*
• log/* (except for the audit logs)
• data/db* (HSQL data in the DB is backed up, but the files on disk are not)
• tmp
• the plugins directory (except for the installed-plugins directory)

Note that the caches directory is included in the backup because it contains previously indexed heads.

## Backing up Stash using the client

The Backup Client must be run from somewhere with access to the Stash home directory. Usually, you will run the Backup Client directly on the Stash server.  Run the client with the following command:

java -jar <path/to/stash-backup-client.jar>

Configuration options are kept in the backup-config.properties file that is included with the client – this file is automatically read when the client is run. The properties are fully documented in the backup-config.properties file, but include:

 stash.home Defines the location of the home directory of the Stash instance you wish to back up or restore to. REQUIREDIf omitted here it will be taken from the STASH_HOME environment variable or the Java system property of the same name if supplied to the Backup and Restore Client on the command line. As a required value, backup and restore will fail if it is not supplied through one of these mechanisms. stash.user Defines the username of the Stash user with administrative privileges you wish to perform the backup. REQUIREDIf omitted here it will be taken from the Java system property of the same name if supplied to the Backup Client on the command line. As a required value, backup will fail if it is not supplied through one of these mechanisms. stash.password Defines the password of the Stash user with administrative privileges you wish to perform the backup. REQUIREDIf omitted here it will be taken from the Java system property of the same name if supplied to the Backup Client on the command line. As a required value, backup will fail if it is not supplied through one of these mechanisms. stash.baseUrl  Defines base URL of the Stash instance you wish to back up. REQUIREDIf omitted here it will be taken from the Java system property of the same name if supplied on the command line to the Backup Client. As a required value, backup will fail if it is not supplied through one of these mechanisms. backup.home Defines where the Backup Client will store its own files, such as backup archives.If not specified, these files are stored beneath the working directory for the Backup Client. Backup files will be stored in a backup subdirectory and logs will be stored in a logs subdirectory.Note that on Windows, you must use two backslashes between paths.  E.g. C:\\path\\to\\folder or instead use the forward slash e.g. C:/path/to/folder.

Alternatively, these properties can be given on the command-line, when they need to be prefixed with "-D", and be placed before the "-jar" parameter. For example:

java -Dstash.password="pass" -Dstash.user="user" -Dstash.baseUrl="http://stash" -jar stash-backup-client.jar

## Cancelling the client backup

You can cancel the running client backup operation if necessary.

To cancel the backup:

1. Copy the cancel token echoed by the client in the terminal (or the Command Prompt on Windows):

2. Go to the Stash interface in your browser. Stash will display this screen:

3. Click Cancel backup, and enter the cancel token:

4. Click Cancel backup.

## Restoring Stash into the backed-up DB instance

In order to ensure accidental restores do not delete existing data, the restore client will only restore into an empty home directory and an empty database. Therefore, if you intend to perform the restore into the current environment, make sure that these prerequisites are met.

Run the client with the following command:

java -Dstash.home="path/to/stash/home" -jar stash-restore-client.jar

## Restoring Stash into a newly created DB instance

When restoring Stash, the restore client must be run on the machine that Stash should be restored to. In order to ensure accidental restores do not delete existing data, the restore client will only restore into an empty home directory and an empty database.

The new database should be configured following the instructions in Connecting Stash to an external database and its sub-page that corresponds to your database type.

If you are using MySQL

The JDBC drivers for MySQL are not bundled with the Backup Client (due to licensing restrictions). You need to download and install the driver yourself.

3. Copy the mysql-connector-java-5.1.XX-bin.jar file from the extracted directory to your <path/to/backup/client>  /jdbc directory.

The restore client also uses the  backup-config.properties  file. The properties are fully documented in the backup-config.properties file, but include:

 stash.home The full path to a directory that the restore client will populate with the Stash home data. This directory must be empty. On Windows, you must use two backslashes ( \\ ) or a single forward slash ( / ) to separate paths. jdbc.override By default, the restore client will restore into the same database that was backed up. If jdbc.override is set to true, the restore client will restore into the database specified by the jdbc properties in the table below. The database must be empty. jdbc.driver  The driver class that Stash should use to login to the new database. See examples below. jdbc.url The connection details for the new database, formatted as a JDBC URL. See examples below. jdbc.user The username that Stash should use to login to the new database. jdbc.password The username that Stash should use to login to the new database.

### Example use of JDBC properties

Example jdbc.driver and jdbc.url properties are shown below:

Databasejdbc.driverjdbc.url
MySQLcom.mysql.jdbc.Driver

jdbc:mysql://HOSTNAME:PORT/DATABASE?autoReconnect=true&characterEncoding=utf8&useUnicode=true&sessionVariables=storage_engine%3DInnoDB

Oracleoracle.jdbc.driver.OracleDriverjdbc:oracle:thin:@//HOSTNAME:PORT/SERVICE
PostgreSQLorg.postgresql.Driverjdbc:postgresql://HOSTNAME:PORT/DATABASE
SQL Servercom.microsoft.sqlserver.jdbc.SQLServerDriverjdbc:sqlserver://HOSTNAME:PORT;databaseName=DATABASE;

### Setting JDBC properties on the command line

You can also set JDBC properties on the command line with the following command:

java -Djdbc.override=true -Djdbc.driver=org.postgresql.Driver -Djdbc.url=jdbc:postgresql://HOSTNAME:PORT/DATABASE -Djdbc.user=dbuser -Djdbc.password=dbpasswd -Dstash.home="path/to/stash/home" -jar /path/to/stash-restore-client.jar /path/to/original/backup/file
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