Create Backup from Hetzner Storage Box to Synology DSM using ActiveBackup For Business

rsync

#!/bin/bash

# Backing up a Hetzner Storage box TO the Synology DSM does not work easily due to
# the special rsync paths requhired by Hetzner which is /home as root. However, Synology
# does not allow the and requests the path // - which is basically the root. Hetzner
# not allow that in turn. This script solves the issue by being a wrapper to rsync,
# which modifies the command to reflect that change.
#
# Script is provided as is, for free, no guarantees given. Use at your own risk.
#
########################################################################################
# SETUP
# -----
# This script has to be placed into the /bin directory to work as drop-in-replacement
# For that you have to:
# cp -a /bin/rsync /bin/rsync_
# cat > /bin/rsync 
# <CAT THE SCRIPT>
# chmod go+rx /bin/rsync
########################################################################################

pattern="^\w+@.*://.*$"

if [ $# -lt 1 ]; then
  echo "Error: No source path provided."
  echo "Usage: rsync_wrapper.sh <rsync arguments>"
  exit 1
fi

modified_args=("$@")  # Initialize with original arguments

for ((i=1; i<=$#; i++)); do
  source="${modified_args[i]}"

  if [[ $source =~ $pattern ]]; then
    modified_args[i]="${source//:\/\//:\/home}"
  fi

  # Optional debug: Print each parameter
  # echo "Parameter $i: ${modified_args[i]}"
done

# Print modified arguments
# echo "Modified arguments: ${modified_args[@]}"

# Execute the rsync_ command
/bin/rsync_ "${modified_args[@]}"