Document how to configure automatic backup with external task scheduler.

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+## 2.3 Automatic Regular Backup
+
+Currently KBackup does not support automatic backup by itself. However, If application level scheduled tasks are available to you, such as *crontab* in Linux and *Task Scheduler* in Windows, you can use that to trigger backup tasks regularly.
+
+### 2.3.1 On Linux
+
+In order to run Minecraft command on your server as a Shell command, you need RCON client like [mcrcon](https://github.com/Tiiffi/mcrcon). You can get the binary executable from its homepage and put it into anywhere like `/usr/bin`.
+
+Let's assume you are under Linux, run `crontab -e` and append this line to the configuration:
+
+```shell
+0 */6 * * * mcrcon -P <RCON port> -p <RCON password> "kb backup"
+```
+
+You can specify RCON port and password in `server.properties`.
+
+This will cause `cron` to run `kb backup` for every 6 hours. To make incremental backups, simply replace `kb backup` to `kb incbak`.
+
+The man page [crontab(5)](https://man7.org/linux/man-pages/man5/crontab.5.html) also contains many useful information about using cron.
+
+### 2.3.2 On Windows
+
+For Windows users, please refer to [tutorials available on Google](https://www.google.com/search?q=create+scheduled+task+in+windows) for creating scheduled tasks. Note that mcrcon is also available on Windows.
+
 # 3. To-Do List
 
 - A more friendly help menu (colored command help menu)