# Backup and Restore

> 来源：BookStack 官方文档（开源）。原图外链已省略。

While BookStack does not currently have a built-in way to backup and restore content,
it can usually be done via the command line with relative ease.
The below commands are based on using Ubuntu. If you are using a
different operating system you may have to alter these commands to suit.

---

### Backup

There are two types of content you need to backup: Files and database records.

#### Database

The easiest way to backup the database is via `mysqldump`:

```bash
# Syntax
## Only specify the `-p` option if the user provided has a password
mysqldump -u {mysql_user} -p {database_name} > {output_file_name}


# Example
mysqldump -u benny bookstack > bookstack.backup.sql
```

If you are using MySQL on Ubuntu, and are using the `root` MySQL
user, you will likely have to run the command above with `sudo`:

```bash
sudo mysqldump -u root bookstack > bookstack.backup.sql
```

The resulting file (`bookstack.backup.sql` in the examples above) will contain
all the data from the database you specified. Copy this file to somewhere safe,
ideally on a different device.

#### Files

Below is a list of files and folders containing data you should back up. The paths
are shown relative to the root BookStack folder.

* `.env` - File, contains important configuration information.
* `public/uploads` - Folder, contains any uploaded images.
* `storage/uploads` - Folder, contains uploaded page attachments.
* `themes` - Folder, contains any configured [visual/logical themes](/docs/admin/hacking-bookstack/#visual-theme-system).

Alternatively you could backup up your whole BookStack folder but only the above
contain important instance-specific data by default.

The following command will create a compressed archive of the above folders and
files:

```bash
tar -czvf bookstack-files-backup.tar.gz .env public/uploads storage/uploads themes
```

The resulting file (`bookstack-files-backup.tar.gz`) will contain all your file
data. Copy this to a safe place, ideally on a different device.

---

### Restore

If you are restoring from scratch follow the [installation](/docs/admin/installation)
instructions first to get a new BookStack instance set-up but
**do not run the `php artisan migrate` installation step when installing BookStack**.
You may need to comment this command out if using an installer script.

If you are using a docker-container-based set-up, restore the database before running the BookStack container.
An example of the process using a linuxserver.io-based docker-compose setup can be seen [in our video here](https://youtu.be/6A8hLuQTkKQ?t=1050).

#### Database

To restore the database you simply need to execute the sql in the output file from the `mysqldump`
you performed above. To do this copy your database SQL backup file onto the
BookStack or database host machine and run the following:

```bash
# Syntax
mysql -u {mysql_user} -p {database_name} < {backup_file_name}
## Only specify the -p if the user provided has a password

# Example
mysql -u benny -p bookstack < bookstack.backup.sql

# If using the root user on Ubuntu you may
# have to run the above with root permissions via sudo:
sudo mysql -u root bookstack < bookstack.backup.sql
```

If you are restoring to a new version of BookStack you will have to run
`php artisan migrate` after restore to perform any required updates to the database.

#### Files

To restore the files you simply need to copy them from the backup archive
back to their original locations.  If you created a compressed `bookstack-files-backup.tar.gz`
archive as per the backup instructions above you can simply copy that file to
your BookStack folder then run the following command:

```bash
tar -xvzf bookstack-files-backup.tar.gz
```

If you get errors during the above command it may be due to permissions.
Change permissions so you can write to the restore locations.

After a backup of the files you should reset the permissions to ensure any write-required
locations are writable by the server. The locations required for this can be
found in the [installation instructions](/docs/admin/installation).

#### Configuration (.env File)

During a restore, you may end up merging various configuration options between your 
old and new instance `.env` files, to get things working for the new environment.
For example, it's common to use the old `.env` settings for most things but use database
settings from the `.env` file of a newly created instance. 

One thing to be aware of is that you should use the `APP_KEY` value of the old `.env` file since
this is used for various features like the encryption of multi-factor authentication credentials.
Changing the `APP_KEY` may cause such features to break.

#### URL Changes

If you are restoring into an environment where BookStack will run on a different URL,
there are a couple of things you'll need to do after restoring everything:

- Within the `.env` config file update the `APP_URL` value to exactly match your new base URL.
- Run the ["Update System URL" command](/docs/admin/commands/#update-system-url) to update your database content to use your new URL.

If you migrated web-server configuration files, you may also need to tweak those to correctly use the new URL.