Fixed missing --del in backup units

backup-files-rsync.service

@@ -4,9 +4,10 @@ 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 -HAax ${EXCLUDES} "${SOURCE}/" "${DESTINATION}/"'
+ExecStart=/bin/sh -c "/usr/bin/rsync ${OPTIONS} ${EXCLUDES} '${SOURCE}/' '${DESTINATION}/'"