---
title: "Signer on Docker - Persistent data (backup considerations)"
description: "Persistent data of Signer on Docker: the two volumes and two secrets that hold everything needed to recreate the stack, for backup planning."
canonical: "https://docs.lacunasoftware.com/en-us/articles/signer/on-premises/docker/docker-swarm/persistent-data"
locale: "en"
product: "Signer"
last_updated: "2026-07-17"
---

# Signer on Docker - Persistent data (backup considerations)

The [standard Docker compose file for Signer](https://cdn.lacunasoftware.com/signer/docker/signer-stack.yml) uses two volumes:

* **sql**: database files
* **files**: files stored outside of the database (to keep the database tidy)

> **Note**
>
> The *sql* and *files* volumes will probably be mapped by your container orchestrator to the automatically
> created volumes **signer_sql** and **signer_files**

Feel free to alter these volumes according to your infrastructure, for instance mapping them to folders on the host.

The stack also uses two secrets, generated manually during the setup:

* **signer_sql_password**: SQL server SA password
* **signer_encryption_key**: encrypts secrets such as session states

These **two volumes and two secrets** contain all data needed to recreate the Signer stack. No additional data is persisted inside the
containers, and the stack may be recreated freely at any time.

> **Caution**
>
> On a production environment, make sure you take the necessary steps to backup these resources!

## See also

* [Installing Signer on Docker](https://docs.lacunasoftware.com/en-us/articles/signer/on-premises/docker/docker-swarm)
* [Using an external database on Docker](https://docs.lacunasoftware.com/en-us/articles/signer/on-premises/docker/docker-swarm/external-db)
* [Enabling SSL on Docker](https://docs.lacunasoftware.com/en-us/articles/signer/on-premises/docker/docker-swarm/enable-ssl)
* [Checking the system logs on Docker](https://docs.lacunasoftware.com/en-us/articles/signer/on-premises/docker/docker-swarm/check-logs)
* [Using a stack with GrantID](https://docs.lacunasoftware.com/en-us/articles/signer/on-premises/docker/docker-swarm/internal-grantid)