🐳 Docker Stack Volume Backup Script

This script automates backups of Docker stacks by identifying containers labeled with SDVB=..., stopping them, archiving their named volumes, and restarting them. It’s designed to work across systems like TrueNAS SCALE and Debian, backing up only Docker-managed volumes (not bind mounts or host paths).

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🔧 What It Does

• Discovers all running containers with a SDVB label.
• Groups containers by unique SDVB= value (e.g., SDVB=Netbox, SDVB=Gitea).
• Stops containers in each stack to ensure volume consistency.
• Identifies named Docker volumes (ignores bind mounts and host paths).
• Creates a .tar archive of each stack’s volumes in a specified backup directory.
• Restarts containers after backup is complete.

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📦 Backup Format

Each backup file is named:

<StackName>Backup<YYYY-MM-DD>.tar

Example:

Netbox_Backup_2025-10-05.tar

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🗂 Directory Structure

Backups are stored in:

/mnt/Backups

You can change this path by editing the BACKUP_DIRECTORY variable in the script, oterwise you need to ensure /mnt/Backups exists.

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🚀 How to Use

🚀 How to Use

1. Label your containers with SDVB=StackName in your Docker Compose or run commands. Example:

   labels:
     - SDVB=Netbox
   

2. Place the script on your host system (e.g., /usr/local/bin/docker_stack_backup.sh).

3. Make it executable:

   chmod +x docker_stack_backup.sh
   

4. Run the script manually:

   ./docker_stack_backup.sh
   

4.b (Optional) Automate with cron: crontab -e 0 2 * * * /usr/local/bin/docker_stack_backup.sh >> /var/log/docker_backup.log 2>&1 5. Bonus: Use Rclone on Script Completion to copy the contents to a backup storage of your choosing