You only need to read your SLA document, which tells you automatic backups are made every night. No need to issue support tickets.
You need to create a support ticket @ https://support.mendix.com/ for this.
Edit after down votes:
In a support ticket you can ask things what other forum users don't have to know. And because the support portal is meant to ask questions about specific customer applications. In other words, it was just a suggestion.