> For the complete documentation index, see [llms.txt](https://docs.nodeum.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nodeum.io/data-archiving/system-reliability/failover-procedure-one-site.md).

# Failover Procedure - One Site

### Consideration 

1. Nodeum has been erased or alterated
2. Configuration in Nodeum has been erased or alterated
3. Caching Disk is not impacted.

### Prerequesites

**Step 1 :** 

Activate the backup feature, then the backup is done in a regular basis (defined during the backup configuration).  Be careful to export this backup. 

**Step 2 :** 

Move the generated backup to external devices. 

### In case of failure

**Step 1** : Reinstall Nodeum from scratch in using the last Ansible packages 

**Step 2** : Copy the generated [backup](/data-archiving/system-reliability/backup-and-restore.md#backup) into a folder in Nodeum server. 

**Step 3** : Restore the backup in using the appropriated procedure. 

**Step 4** : The server is now back online.


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