Simple backup

README.md

Simple backup

A simple backup solution using docker and duplicati to perform remote encrypted incremental backups of a folder

Requirements

• curl
• docker

Installing

Run curl https://gist.githubusercontent.com/morten-olsen/729008a69ed1f0f796d215ba8af7dc5a/raw/install.sh | bash in the directory where you want to setup backup

This will install ./backup.sh which is the file to start backups and restores on the specific folder, as well as /usr/bin/dbackups.sh if not already installed, which is the man backup runner

To perform a backup run ./backup.sh backup which if first run will ask you for the target. See https://duplicati.readthedocs.io/en/latest/05-storage-providers/ for compatible targets. Currently file:// targets are not supported, due to sandboxing.

To restore the latest backup run ./backup.sh restore

It creates a .backupdb folder inside the backup location which stores backup state to facilitate managing state, and perform incremental backups.

Each run will ask for an encryption password if no "BACKUP_PASS" environmnent variable is set.

Automatic backup

The easiest way to run periodic backups is to set the script up to run in cron. Remeber that you will need the BACKUP_PASS variable set, to run it non-interactive

backup.sh

#!/bin/bash

SOURCE="${BASH_SOURCE[0]}"
while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
  DIR="$( cd -P "$( dirname "$SOURCE" )" >/dev/null 2>&1 && pwd )"
  SOURCE="$(readlink "$SOURCE")"
  [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
done
DIR="$( cd -P "$( dirname "$SOURCE" )" >/dev/null 2>&1 && pwd )"

CMD_LOCATION="/usr/bin/dbackup.sh"
GIST_ID="morten-olsen/729008a69ed1f0f796d215ba8af7dc5a"
GIST_LOCATION="https://gist.githubusercontent.com/$GIST_ID/raw/dbackup.sh"
COMMAND="$1"
shift

if [ ! -f "$CMD_LOCATION" ]; then
  sudo curl "$GIST_LOCATION" -o "$CMD_LOCATION"
  sudo chmod +x "$CMD_LOCATION"
fi

"$CMD_LOCATION" "$COMMAND" "$DIR"

dbackup.sh

#!/bin/bash

COMMAND="$1"

[ -f "$HOME/.secrets" ] && source "$HOME/.secrets"
shift
SOURCE="$1"
shift

DATA_LOCATION="$SOURCE/.backupdb"
CONFIG_LOCATION="$DATA_LOCATION/config"
DB_LOCATION="$DATA_LOCATION/db"

mkdir -p "$CONFIG_LOCATION"
mkdir -p "$DB_LOCATION"
TARGET="dropbox://backups/$1?authid=$DROPBOX_AUTH_TOKEN"
shift

case "$COMMAND" in
  "backup")
    docker run -it --rm \
      -v """$SOURCE:/source""" \
      -v """$CONFIG_LOCATION:/config""" \
      -v """$DB_LOCATION:/app/db""" \
      linuxserver/duplicati \
      mono /app/duplicati/Duplicati.CommandLine.exe \
        backup \
        $TARGET /source \
        --dbpath="/app/db/db.sqlite" \
        --exclude="/source/.backupdb/*" \
        --encryption-module="aes" \
        --compression-module="zip" \
        --dblock-size="50mb" \
        --keep-time="3M" \
        --passphrase="$BACKUP_PASS"
    ;;
  "restore")
    docker run -it --rm \
      -v """$SOURCE:/source""" \
      linuxserver/duplicati \
      mono /app/duplicati/Duplicati.CommandLine.exe \
        restore $TARGET \
          --restore-permissions=true \
          --passphrase="$BACKUP_PASS"
    ;;
  *)
    echo "Command not found";;
esac

install.sh

#!/bin/bash

CMD_LOCATION="$PWD/backup.sh"
GIST_ID="morten-olsen/729008a69ed1f0f796d215ba8af7dc5a"
GIST_LOCATION="https://gist.githubusercontent.com/$GIST_ID/raw/backup.sh"

curl -o "$CMD_LOCATION" "$GIST_LOCATION"
chmod +x "$CMD_LOCATION"