Level 4: Reliability, security & cloud · L4.3 Fault tolerance, disaster recovery & multi-region
RTO, RPO and the four DR strategies
Choose backup/restore, pilot light, warm standby or active-active from RTO/RPO and cost.
13 min · Pro
What you take away
- RPO is how much data you may lose, measured backwards from the failure; RTO is how long until you are serving again, measured forwards.
And 3 more inside the class, in Pro.
How the class is laid out
- The problem
- Two numbers, measured in opposite directions
- The four strategies are a cost ladder
- RTO is mostly not the technical switch
- Check your understanding