Script to make backups inspired from https://nerdyarticles.com/backup-strategy-with-restic-and-healthchecks-io/

restic-backup.sh

#!/bin/bash

# Define variables
RESTIC_BIN="restic"
RESTIC_PASSWD=".passwd"
BACKUP_SOURCE="Photos Immich"
BACKUP_REPO="sftp://localhost:2220//backup_path --limit-upload 8545"
WEBHOOK_URL="https://hc-ping.com/<UUID>"
KEEP_OPTIONS="--keep-daily 7 --keep-weekly 6 --keep-monthly 12 --keep-yearly 99"
RUN_UUID=$(cat /proc/sys/kernel/random/uuid)
CURL_CMD="curl -fsS -m 10 --retry 5 -o /dev/null"

# Sending start ping to measure runtime
$CURL_CMD "$WEBHOOK_URL/start?rid=$RUN_UUID"

# Function to run a command and capture its output to a temp file
run_command() {
  local CMD="$1"                           # Takes the first argument as the command to be executed
  TMP_FILE=$(mktemp)
  echo "Running: $CMD" | tee "$TMP_FILE"   # Logs the command being executed to $TMP_FILE
  $CMD | tee -a "$TMP_FILE" 2>&1           # Executes the command and redirects both stdout and stderr to $TMP_FILE
  STATUS=$?                                # Checks the exit status of the last command
  # Log output to Heathchecks
  $CURL_CMD --data-raw "$(cat $TMP_FILE)" "$WEBHOOK_URL/log?rid=$RUN_UUID"
  rm "$TMP_FILE"
  if [ $STATUS -ne 0 ]; then
    # Sends ping to Heathchecks with the failure code
    # Deletes the TMP_FILE
    # Exits the bash script
    $CURL_CMD "$WEBHOOK_URL/$STATUS?rid=$RUN_UUID"
    exit $STATUS
  fi
}

# Perform Restic unlock and capture output
run_command "$RESTIC_BIN -p $RESTIC_PASSWD -r $BACKUP_REPO unlock"

# Perform Restic backup
run_command "$RESTIC_BIN -p $RESTIC_PASSWD -r $BACKUP_REPO backup $BACKUP_SOURCE"

# Perform Restic forget
run_command "$RESTIC_BIN -p $RESTIC_PASSWD -r $BACKUP_REPO forget $KEEP_OPTIONS --prune --cleanup-cache"

# Send success
$CURL_CMD "$WEBHOOK_URL?rid=$RUN_UUID"