Sharepoint 2013 - Backup tasks

https://blogs.technet.microsoft.com/meamcs/2013/02/23/sharepoint-2013-backup-with-powershell-and-task-scheduler-for-beginners/

https://blog.blksthl.com/2014/03/10/the-easy-guide-to-creating-a-scheduled-task-running-as-system/