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BorgBackup in docker

guide by example

purpose

Backup terminal utility.

files and directory structure

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

The setup

Borg is installed directly on the host system.
A script is created that backs up entire docker directory somewhere locally.
Cronjob executing the script daily.

The script needs manual initialization of a repo somewhere.

Install borg backup

The script

Repo needs to be initialized manualy first.

borg-backup.sh

#!/bin/bash

# INITIALIZE THE REPO WITH THE COMMAND:
#   borg init --encryption=none /mnt/C1/backup_borg/
# THEN RUN THIS SCRIPT

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

BACKUP_THIS='/home/spravca/docker /etc'
REPOSITORY='/home/spravca/borg_backup/docker_backup'
LOGFILE='/home/spravca/borg_backup/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

cron job, every day at 3:00
crontab -e 0 3 * * * /home/bastard/borg_backup/borg-backup.sh

Remote backup

Backing up to network share or cloud, rclone

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