Another activity involved in the case of Dynamics 365 CE on-premises is installing updates. These updates can be specific to SQL Server security or reporting service updates. We can get these updates from Microsoft Windows Updates as well. These can be downloaded automatically, and we can also delete them manually.
You can find more details about updating Dynamics 365 CE on-premises at https://docs.microsoft.com/en-us/dynamics365/customerengagement/on-premises/deploy/update-microsoft-dynamics-crm.