Azure Recovery Vault policies can only schedule one back a day.  This may not be frequently enough for some organizations.  On-demand backups can be initiated with PowerShell.  In this video, we use an Azure Function to schedule on-demand backup recovery points throughout the day.

Links:

Zero to Hero with Windows Virtual Desktop:
https://www.ciraltos.com/zero-to-hero-with-windows-virtual-desktop/

Project Code:
https://github.com/tsrob50/AzureFunctionDemos/tree/master/ScheduleOnDemandRecoveryPoints