[Unit] Description=Backup Files [Service] Environment=SOURCE=/path/to/source Environment=DESTINATION=user@host:/path/to/destination Environment=OPTIONS="-HAax --del" Environment=EXCLUDES="--exclude path1 --exclude path2" Type=simple Nice=19 IOSchedulingClass=2 IOSchedulingPriority=7 ExecStart=/bin/sh -c "/usr/bin/rsync ${OPTIONS} ${EXCLUDES} '${SOURCE}/' '${DESTINATION}/'"