> 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/detalles/requirements-and-limits.md).

# Requirements and Limits

Before activating a plan, it is worth reviewing these conditions to avoid surprises. Some of them we confirm with the current platform and are marked.

### Source requirement

> #### 🚧 The source must be in a single zone
>
> You can only protect a subscription whose elements are in a single availability zone. 
>
> If the subscription distributes resources across multiple zones, it will not appear in the list of possible sources.

### Compatibility

| Aspect            | Detail                                                                                                                          |
| ----------------- | ------------------------------------------------------------------------------------------------------------------------------- |
| Source type       | Server and Remote Desktop subscriptions                                                                                         |
| Operating systems | Broad compatibility target with Windows and Linux systems {/\* TO BE VERIFIED exact scope and whether it requires an agent \*/} |

> #### 🚧 Agent on the machine
>
> It is still to be confirmed whether the source needs an in-machine component or not. 
>
> The product document describes agentless replication, while an earlier tutorial mentioned updating an agent on older Windows machines. We will clarify this before publishing.

### Known limitations

| Limitation                  | Detail                                                                                                                                        |
| --------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
| SSH keys at the destination | After a failover evacuation, the source SSH keys may not appear in the Recovery site panel {/\* TO BE VERIFIED with the current platform \*/} |
| IP failover                 | The IP failover mode is not yet available (coming soon); today failover is via DNS                                                            |

### Where to go next

* What is replicated from the environment: [What is replicated.](/docs-en/productos/disaster-recovery/detalles/what-gets-replicated.md)
* How the backup is activated: [Failover and failback.](/docs-en/productos/disaster-recovery/concepts/failover-and-failback.md)


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