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BorgBackup in docker

guide by example

Purpose & Overview

Backups.

Borg is an open source deduplicating archiver with compression and encryption.
Written in python with performance critical code implemented in C/Cython.

Highlight of borg is the deduplication, where files are cut in to variable size chunks, and only new chunks are stored. This allows to keep snapshots from several days, weeks and months, while not wasting disk space.

In this setup borg is installed directly on the host system.
A script is created that backs up the entire docker directory locally.
Cronjob is executing this script daily.

files and directory structure

/home/
└── ~/
    ├── borg/
    │    ├── docker_backup/
    │    ├── borg_backup.sh
    │    └── borg_backup.log
    │
    └── docker/
        ├── container-setup #1
        ├── container-setup #2
        ├── ...

docker_backup/ - borg repository, created by borg init command
borg_backup.sh - the backup script that adds archive in to the repository
borg_backup.log - log file with dates of backups

The setup

Install BorgBackup

Borg is likely in your linux repositories.

Create a new borg repo

mkdir ~/borg
borg init --encryption=none ~/borg/docker_backup

The backup script

borg_backup.sh

#!/bin/bash

# INITIALIZE THE REPO WITH THE COMMAND:
#   borg init --encryption=none ~/borg/my_backup
# THEN RUN THIS SCRIPT

# -----------------------------------------------

BACKUP_THIS='/home/bastard/docker /etc'
REPOSITORY='/home/bastard/borg/docker_backup'
LOGFILE='/home/bastard/borg/borg_backup.log'

# -----------------------------------------------

NOW=$(date +"%Y-%m-%d | %H:%M | ")
echo "$NOW Starting Backup and Prune" >> $LOGFILE

# CREATES NEW ARCHIVE IN PRESET REPOSITORY

borg create                                     \
    $REPOSITORY::'{now:%s}'                     \
    $BACKUP_THIS                                \
                                                \
    --compression zstd                          \
    --one-file-system                           \
    --exclude-caches                            \
    --exclude-if-present '.nobackup'            \
    --exclude '/home/*/Downloads/'              \

# DELETES ARCHIVES NOT FITTING KEEP-RULES

borg prune -v --list $REPOSITORY                \
    --keep-daily=7                              \
    --keep-weekly=4                             \
    --keep-monthly=6                            \
    --keep-yearly=0                             \

echo "$NOW Done" >> $LOGFILE
echo '------------------------------' >> $LOGFILE

# --- USEFULL SHIT ---

# setup above ignores directories containing '.nobackup' file
# make '.nobackup' imutable using chattr to prevent accidental removal
#   touch .nobackup
#   chattr +i .nobackup

# in the repo folder, to list available backups:
#   borg list .
# to mount one of them:
#   borg mount .::1584472836 ~/temp
# to umount:
#   borg umount ~/temp
# to delete single backup in a repo:
#   borg delete .::1584472836

the script must be executabe - chmod +x borg_backup.sh

Automatic execution

as root, cron job every day at 3:00
su - switch to root
crontab -e
0 3 * * * /home/bastard/borg/borg_backup.sh
crontab -l

Remote backup

Backing up borg repo to a network share or cloud using rclone

To be continued

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