rsync backup script

gistfile1.txt

#!/usr/bin/env bash

# -e: Exit at the first failed command
# -u: Unset variables are errors (exit script)
set -eu

sudo mkdir -p /var/log/[nasname]-backup

BACKUP_TIMESTAMP=$(date +%Y.%m.%d-%H.%M.%S);

(
  time sudo \
    rsync \
      --archive \
      --human-readable \
      --verbose \
      --executability \
      --whole-file \
      --delete \
      -e "ssh -i /home/[servername]/.ssh/id_ed25519" \
      /mnt/volume01 \
      [mynasuser]@[mynashostname]::backup/[servername] \
) 2>&1 | sudo tee /var/log/[nasname]-backup/backup-${BACKUP_TIMESTAMP}.log