Deactivated Autosave Word Online

I'm just worried when there's a typing error but it's saved automatically, thanks for the information.

In OneDrive, automatic saving is the only way you can save. Sure, you can download a copy of your online document to your local device, but beyond that there is no manual saving. Also, note that the downloaded copy can't be further edited using Word online. 

Seems not, AutoSave is always on when working in Word Online with files stored in OneDrive or SharePoint