Data Warehouse that is provided by SageData can secured behind a firewall with the access to the Data Warehouse being limited only to a specific IP or a range of IPs.
To turn this feature on and limit access to only specific IP addresses go to Settings and scroll down to the section that says Limit access to DWH, ETL, Reporting by IP. In this section you can enter a range of IPs to be whitelisted in CIDR format. If it is just a single ip, it should be followed by /32 like this: 1.1.1.1/32
Once you add at least one IP your Data Warehouse will be automatically restricted from public access and placed behind a firewall accessible only with the IP or IP ranges provided.