dailyBackup.sh

#!/bin/bash

#run as user for notifications
if [ "$(id -u)" -eq 0 ]; then
    echo "Do not run as root!";
    exit 1
fi


TIMEDIFF=82800 #23h, 24h=86400
TIMESTAMPFILE="~/.config/backintimecron/time.txt"
LOGFILE="~/.config/backintimecron/log.txt"
NOW=$(date +%s)

LAST=$(cat $TIMESTAMPFILE)
if [ -n "$LAST" ]; then
  echo "$TIMESTAMPFILE was read!"
else
  echo "$TIMESTAMPFILE was not readable!"
  touch $TIMESTAMPFILE
fi



log() {
        echo "$1"
        echo "$1" >> $LOGFILE
}

show() {
        log "$1"
        # Required so that notify-send works from user's cron
        XDG_RUNTIME_DIR=/run/user/$(id -u) notify-send "$1"
}

exec_window() {
    #Additional Checks may be necessary, in my script, i check if the remote host is reachable
    show "$1"
    echo $NOW > $TIMESTAMPFILE
    
    #Todo: check how that works with multiple profiles
    /usr/bin/nice -n19 /usr/bin/ionice -c2 -n7 /usr/bin/backintime backup

    # This shows prematurely, since backintime exits immediately because it only triggers a new process.  
    #show "Done."
}

DELTA=$((NOW - LAST))

log "$DELTA seconds since last backup started."


if [ "$DELTA" -ge $TIMEDIFF ];
then
        exec_window "Make backup, because some windows have been missed!"
        exit
fi


NOWHUMAN=$(date +%H:%M)
log $NOWHUMAN
if [[ "$NOWHUMAN" > "18:00" ]] && [[ "$NOWHUMAN" < "19:00" ]]; then
        if [ "$DELTA" -ge 7200 ];
        then
                exec_window "Make backup, we are in schedule!"
        else
                show "Dont make scheduled backup, since the last one is not older than 2h"
        fi
else
        log "Not in schedule."
fi