Disaster recovery is the set of plans, tools and procedures for restoring systems and data after a major outage, data loss or regional failure. It aims to resume service within agreed time and data-loss limits.
An incident postmortem is a written review held after an outage or serious failure. It records what happened, why it happened and how the response went, then commits to specific changes that make a repeat less likely.
Public, private and hybrid cloud are the main cloud deployment models, describing where computing resources run and who shares them. Public cloud is shared provider infrastructure, private cloud serves one organisation, and hybrid connects the two.
A service level objective (SLO) is an internal reliability target for a service, such as the share of requests that must succeed quickly. It defines what good enough looks like for users over a rolling window.
Cloud-native describes software designed from the start to run in the cloud. It is typically built from containers and microservices, managed declaratively and automated to scale, recover and update.
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