BorgBackup solution for mailcow

Backup your mailcow-dockerized with borg

About The Project

This project is intended to provide an easy way to add a backup solution with Borg to an existing Mailcow installation. This backup solution backs up the data of the mailcow to a configurable Borg repository server with a configurable interval and number of backup versions.

Getting Started

The installation guide assumes in this case that a working mailcow-dockerized stack is installed and a Hetzner StorageBox is used as backup target.

Preparation

• Create the required directories and files:

  $ mkdir -p /opt/backup/mailcow/secrets
  $ touch /opt/backup/mailcow/secrets/borg_repo_pw
  

• Create an SSH key for authentication to the Borg repository using ssh-keygen -t ed25519 -a 100 and save it as /opt/backup/mailcow/secrets/id_rsa:

  $ ssh-keygen -t ed25519 -a 100
  Generating public/private ed25519 key pair.
  Enter file in which to save the key (/root/.ssh/id_ed25519): /opt/backup/mailcow/secrets/id_rsa
  Enter passphrase (empty for no passphrase): 
  Enter same passphrase again: 
  Your identification has been saved in /opt/backup/mailcow/secrets/id_rsa
  Your public key has been saved in /opt/backup/mailcow/secrets/id_rsa.pub
  The key fingerprint is:
  SHA256:Ic8ENYMDEFWwv1o4Hs8sKu00eUUkq/Qqa+PfiJot7uY root@mailcowhost
  The key's randomart image is:
  +--[ED25519 256]--+
  |  o+=++o+        |
  |     =o. o       |
  |  . o o.o        |
  | . o o = .       |
  |  . . o S        |
  |   o o .         |
  |..= = o          |
  |oXo++O           |
  |%E*+oo+          |
  +----[SHA256]-----+
  

• Creating a backup directory on the StorageBox and setting up a user:
  • Connect to a SFTP/SCP client via the address and port 23 on the StorageBox and create a new directory. Give the directory the permission '0700'. Example: BorgBackups/mailcow
  • Create a subdirectory (BorgBackups/mailcow/.ssh) and in it a file named authorized_keys and assign permission 0600 to this file
  • Add to the file authorized_keys on your StorageBox the content of the file /opt/backup/mailcow/secrets/id_rsa.pub
  • Create a new sub-account in Hetzner's robot interface at your StorageBox and assign the directory BorgBackups/mailcow to it.
    Important: The StorageBox requires SSH access and if the mailcow is outside of the Hetzner network, external access must also be allowed/activated.
• Set the password for the Borg repository:

  $ echo "your super secure password" > /opt/backup/mailcow/secrets/borg_repo_pw
  

Installation

1. Copy the contents of the docker-compose.override.yml.example into your mailcow directory in the file docker-compose.override.yml

2. Open the docker-compose.override.yml file with an editor of your choice and adjust the following lines according to your desired configuration:

   - BORG_REPO=ssh://uXXXXXX-subX@uXXXXXX.your-storagebox.de:23/./backup
   - BACKUP_INTERVAL=hourly
   

   Replace the corresponding usernames in the URL of BORG_REPO and adjust the value of BACKUP_INTERVAL to your desired interval. Possible values are 5min, 15min, hourly, daily, weekly, monthly or custom. If you choose the value custom you also have to copy the file crontab from this repository to /opt/backup/mailcow and adjust it to your needs. Afterwards you add a link to the crontab file in the docker-compose.override.yml:

   borgbackup_unofficial-mailcow:
     volumes:
       ...
       - /opt/backup/mailcow/crontab:/root/crontab
   

3. Start the backup container:

   $ cd /opt/mailcow-dockerized/ && docker-compose up -d
   

For possible values/usage of BORG_REPO, BORG_RSH, BORG_PASSPHRASE, the BORG_*_CMD variables, as well as other borg commands, please consult the borg documentation at
https://borgbackup.readthedocs.io/

And, last but not least:
Always check your logs, attempt restores etc. to be sure it's working!

Roadmap

See the open issues for a list of proposed features (and known issues).

Contributing

Contributions are what make the open source community such an amazing place to be learn, inspire, and create. Any contributions you make are greatly appreciated.

1. Fork the Project
2. Create your Feature Branch (git checkout -b feature/AmazingFeature)
3. Commit your Changes (git commit -m 'Add some AmazingFeature')
4. Push to the Branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

License

Distributed under the GPL-3.0 License. See LICENSE for more information.