Backup Linux-Rechner Lotte

#!/bin/bash
basedir=
user=lotte
mediadir=/media/$user
mountdir=/mnt/$user/autobackup
mediaids=(
  a134880c-d33e-4c70-8227-ea47e6341b1c
  de6ba9c3-cb24-41c0-aea8-a02be20ae30e
)
sourcedirs2backup=(
  /home/lotte
)

LOGFILE=/tmp/rsyncback.log
LOG_MESSAGES=1

# -------------------------------------------------------- functions ---
function message () {
  if [ ! -z $LOG_MESSAGES ]; then
      local msg=$1
      echo `date +"%Y-%m-%d %H:%M:%S"` $msg
  fi
  echo `date +"%Y-%m-%d %H:%M:%S"` $msg 2>&1 >> $LOGFILE
}

# ------------------------------------------------------------- Main ---
if [ ! -d $mediadir ]; then
  message "Error: Mediadir $mediadir does not exist. Exiting."
  exit 1
fi

for mid in "${mediaids[@]}"; do
  echo mid $mid
  if [ -d $mediadir/$mid ]; then
      basedir=$mediadir/$mid
      device=$(mount | grep $mid | cut -d " " -f 1)
      if [ ! -z "$device" ]; then
          break 
      fi
  fi
done
if [ -z "$basedir" ]; then
  message "No configured media mounted. Exiting"
  exit 1
fi
message "Medium mounted. Basedir: $basedir Device: $device"

lastdir=$(ls -1 $basedir | grep -v lost | tail -1)
targetdir=$basedir/$(date +%Y-%m-%d) 

if [ ! -d $targetdir ]; then
  message "performing backup to $targetdir"
  if [ ! -z "$lastdir" ] && [ -d "$basedir/$lastdir" ]; then
      message "copying $lastdir to $targetdir"
      nice cp -al $basedir/$lastdir $targetdir
  else
      message "no dir for copying found in $basedir"
  fi
  rsyncopts="-a -h --numeric-ids --relative --delete --delete-excluded --hard-links --stats"
  rsyncexcludes="--exclude .cache/ --exclude Trash/ --exclude datareporting/archived/ --exclude *msf"
  message "starting rsync"
  for sourcedir in "${sourcedirs2backup[@]}"; do
      nice rsync $rsyncopts $sourcedir $targetdir
  done
  message "backup on $basedir done" 
else
  message "heute schon gebackupt" 
fi
mount -o ro,remount $device $basedir

# Local variables:
# compile-command: "bash /home/springm/projekte/lotte/rsyncback.sh"
# End:

Eine Stunde nach dem Einschalten, weil sonst nicht sichergestellt ist, dass mit der Anmeldung auch die Sicherungsplatte gemountet ist.
Start über '/etc/rc.local' (neu anlegen, wenn die Datei nicht existiert, wird auch auf einem Ubuntu 22 trotz systemd ausgeführt)

#!/bin/bash
if [ ! -f /var/run/rsyncbackup ]; then
  echo /home/lotte/bin/rsyncbackup.sh | at now+60min 2>&1 > /tmp/rc_local_rsyncbackup.log
  touch /var/run/rsyncbackup
fi
exit 0