You can't. That's the use case FOR AWS/GCP. Once the differential between having a in-house team and the AWS premium becomes positive is when you make the switch.
A lot of the discussion here is that the cost of the in-house team is less than people think.
For instance: at a former gig, we used a service in the EU that handled weekends, holidays and night time issues and escalated to our team as needed. It was pretty cheap, approximately $10K monthly fee for availability and hourly rate when there were any issues to be resolved. There were a few mornings I had an email with a post-mortem report and an invoice for a hundred euros or so. We came pretty close to 5 9's uptime but we didn't have to worry about SLA's or anything.
A lot of the discussion here is that the cost of the in-house team is less than people think.
For instance: at a former gig, we used a service in the EU that handled weekends, holidays and night time issues and escalated to our team as needed. It was pretty cheap, approximately $10K monthly fee for availability and hourly rate when there were any issues to be resolved. There were a few mornings I had an email with a post-mortem report and an invoice for a hundred euros or so. We came pretty close to 5 9's uptime but we didn't have to worry about SLA's or anything.