Cloud provider has an outage. Service A goes down completely. Service B keeps working.
The difference is availability zones — physically separate data centres within a cloud region.
A resilient British IPTV reseller spreads their infrastructure across multiple availability zones. One zone failing doesn't kill the service. Traffic shifts seamlessly.
A vulnerable reseller puts everything in one zone. That zone fails? Everything fails. No backup. No failover.
I watched a cloud provider have a 4-hour zone outage. Reseller A was down for the full 4 hours. Reseller B (using the same cloud provider but multiple zones) had zero downtime. Same provider. Different architecture.
A zone-aware British IPTV service designs for zone failure as a normal event, not a disaster. They test zone failover periodically. They know it works because they've verified.
What actually works is asking: "How many availability zones do you use?" A good answer is "at least 2, preferably 3." A concerning answer is "we're in the cloud, we're redundant" without specifics.
The architecturally sound IPTV reseller UK treats zone redundancy as table stakes. They don't brag about it — but their uptime numbers prove it matters.