From the wiki administration console, choose  System Settings .

In the navigation pane, choose Auto Save.

In the Auto Save Settings, select On to enable this option (to disable the option, select Off).

Optional: If the option is set to On, you can specify the time interval between two auto-saving processes by selecting an interval from the Seconds between autosave. The system periodically saves the content of wiki pages.in the specified interval. By default the value of auto-save interval is 30 seconds.

Save your entries.