Daily, weekly and monthly backups of host-mounted docker volumes, with slack notifications.

backup.sh

#!/bin/bash

# make sure we're running as root. need it to backup docker volumes and control services
if [ "$EUID" -ne 0 ]; then
    echo "Please run as root"
    exit
fi

# function to send slack notifications
SCRIPT_PATH=$( cd "$(dirname "${BASH_SOURCE[0]}")" ; pwd -P )
function slack {
    sh "${SCRIPT_PATH}/notify-slack.sh" "$@"
}

# send slack notifications so people prepare if for some reason they're working during the night 
slack "Gonna backup in 30 minutes. Docker services will be shut down while the backup is made."
sleep 20m
slack "10 minutes before starting to backup"
sleep 5m
slack "5 minutes before starting to backup"
sleep 5m

# start the backup process. stop docker daemon and backup locally first
slack "Backup process has started. Docker services are being shut down"
mkdir -p /home/<SOME_USER>/.server-backups/daily
service docker stop
rsync -av --delete /home/<SOME_USER>/<YOUR_VOLUMES_FOLDER>/ /home/<SOME_USER>/.server-backups/daily

# start docker daemon again and send the backup to the server
service docker start
slack "Docker services have been restarted. The backup is being sent to another server." 
chown -R <SOME_USER>:<SOME_USER> /home/<SOME_USER>/.server-backups/daily
sudo -u <SOME_USER> rsync -av --delete /home/<SOME_USER>/.server-backups/daily/ remoteuser@remoteserver:/<REMOTE_FOLDER>/server-backups/daily
slack "Daily backup was done succesfully"

# detect if weekly and monthly backups apply and make the server do the job
DOW=$(date +%u)
DOM=$(date +%d)

if [ $DOW == 1 ]; then
    slack "Creating weekly snapshot"
    sudo -u <SOME_USER> ssh -t remoteuser@remoteserver "rsync -av /<REMOTE_FOLDER>/server-backups/daily/ /<REMOTE_FOLDER>/server-backups/weekly"
    slack "Weekly snapshot ready"
fi

if [ $DOM == 01 ]; then
    slack "Creating monthly snapshot"
    sudo -u <SOME_USER> ssh -t remoteuser@remoteserver "rsync -av /<REMOTE_FOLDER>/server-backups/daily/ /<REMOTE_FOLDER>/server-backups/monthly"
    slack "Monthly snapshot ready"
fi


# cleanup
rm -rf /home/<SOME_USER>/.server-backups

slack "Everything is backed up. Goodnight."

daily-backup.service

[Unit]
Description=Run daily backup

[Service]
User=root
Type=oneshot
ExecStart=/home/<SOME_USER>/server/scripts/backup.sh

daily-backup.timer

[Unit]
Description=Run daily backup

[Timer]
OnCalendar=daily
Persistent=true     
 
[Install]
WantedBy=timers.target

notify-slack.sh

#!/bin/bash

MESSAGE=$@

curl -X POST --data-urlencode "payload={\"channel\": \"#server\", \"username\": \"server\", \"text\": \"${MESSAGE}\", \"icon_emoji\": \":shipit:\"}" https://hooks.slack.com/services/<REST_OF_HOOK_URL>

I made this script to make daily, weekly and monthly snapshots of a folder where I have all of my docker volumes, docker-compose files, configuration files, etc.

Didn't make it accept any parameters, I just removed some hard-coded values and replaced them with obvious hints. But it is pretty straightforward so just read it and modify it to fit your needs.

It also send notifications to Slack to keep record of events.

For this to work, you should:

• Make this run automatically every night, preferably after midnight. Place daily-backup.service and daily-backup.timer on /etc/systemd/system and run "systemctl enable daily-backup.timer && systemctl start daily-backup.timer"
• Make sure you don't have to input a password to ssh into your remote server. Configure access with public key.

It also can be improved by adding some error handling, and additionally creating timestamped backups.