SLA credits, not revenue compensation: Most uptime guarantees compensate with account credit toward hosting costs if the promised percentage isn’t met — this doesn’t cover lost signups, damaged customer trust, or other business impact from an outage.

What counts toward the calculation: Check current terms for what specifically counts as downtime versus excluded scenarios like planned maintenance — this detail matters more than the headline number alone.

Verification through public status pages: A host’s public incident history, where available, gives a more concrete picture of actual reliability than the guarantee percentage in isolation.

It’s worth being clear-eyed that an uptime guarantee’s compensation mechanism — typically account credit — doesn’t replace the actual business cost of downtime during a critical moment. The SLA is a useful signal of a host’s confidence in their infrastructure, but the real protection comes from the underlying architecture actually preventing downtime in the first place, not from the compensation promised if it happens anyway.

Think of the guarantee the way you’d think of a warranty on equipment — it’s reassuring to have, and it reflects the manufacturer’s confidence, but nobody buys equipment hoping to use the warranty. The goal is infrastructure reliable enough that the SLA credit terms rarely, if ever, become relevant in practice, rather than infrastructure you’re routinely filing claims against.

For SaaS teams evaluating multiple hosts, it’s worth asking each provider directly how often they’ve actually had to issue SLA credits historically, if that information is available. A host with a strong architectural track record should have this be a rare occurrence, not a routine part of the customer relationship.