Real-Time Disaster Recovery (DR) Strategy in Production

Hi Team,

I wanted to understand how disaster recovery is handled in real-time production environments across different organizations.

1. How do you decide between Active-Active, Active-Passive (warm standby), and Cold standby architectures?
2. How do you design DR across regions (AWS/Azure/GCP)?
3. What services or tools are typically used for failover and data replication?
4. How frequently do teams perform DR drills or failover testing?
5. If someone wants to practice DR setups hands-on, what is the best way to simulate real-world scenarios? Any suggestions on environments, labs, or approaches?

Looking to learn practical, real-world approaches rather than theoretical concepts.

Thanks in advance!