We use the Microsoft Azure cloud service for the application and all databases.
Microsoft Azure offers maximum security as a leader.
More information about security here.
But there are, of course, companies whose default is to keep NO data on third-party servers.
For this reason, there are basically two different versions:
The application and the database run on Microsoft Azure servers.
Maintenance and backup are done by Microsoft Azure.
Prices of internet version here.
The application and the database run on servers of the customer.
Installation, maintenance and data backup are carried out by the customer himself.
Prices of intranet-version here.