> For the complete documentation index, see [llms.txt](https://docs.plenit.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.plenit.com/docs-en/productos/disaster-recovery/concepts.md).

# Concepts

A recovery plan rests on a few key ideas: replication, failover, failback, and drills. Here they are to help you design yours well.

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>What is Disaster Recovery?</strong></td><td>What the continuity layer is, which services it is built on, and how it differs from backup.</td><td><a href="/pages/4a3eb64c9e4694ee5b687d74043bce0bfb1e8e62">/pages/4a3eb64c9e4694ee5b687d74043bce0bfb1e8e62</a></td></tr><tr><td><strong>Replication</strong></td><td>How replication works, the frequency, the loss window, and the restore points.</td><td><a href="/pages/8538ac2a7153f3e1cb37a09a033c2e9aec70f992">/pages/8538ac2a7153f3e1cb37a09a033c2e9aec70f992</a></td></tr><tr><td><strong>Failover and failback</strong></td><td>How to switch to the backup environment and how to return to the primary one without losing what has been worked on.</td><td><a href="/pages/1d97aa8220d92ce0df7d6f4b0ff9b1f324a9fb97">/pages/1d97aa8220d92ce0df7d6f4b0ff9b1f324a9fb97</a></td></tr><tr><td><strong>Drills</strong></td><td>What a drill is, how to test the plan without affecting production, and the evidence it generates.</td><td><a href="/pages/8b26183e28eba1730ffcd05f96673b293bd71135">/pages/8b26183e28eba1730ffcd05f96673b293bd71135</a></td></tr><tr><td><strong>Glossary</strong></td><td>Definitions of terms specific to Disaster Recovery.</td><td><a href="/pages/8c8856041bb5db032c09e2ec9cd30c51a40074fe">/pages/8c8856041bb5db032c09e2ec9cd30c51a40074fe</a></td></tr></tbody></table>


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