Backup reminder script

#!/bin/bash
DIALOG=Xdialog
BACKUP_SCRIPT=backup_script
BACKUP_TIME="2pm"
BACKUP_DAYS=1
SNOOZE_MINS=5


$DIALOG --display=:0.0 --wrap --title "Backup Reminder" \
--ok-label Continue \
--cancel-label Snooze \
--yesno "You need to do a backup now. Please attach \
your external backup drive and click 'Continue' to continue \
with the backup or 'Snooze' to postpone the backup for a few \
minutes or close the window to skip this scheduled backup \
and reschedule the backup for next time." 15 60 &> /dev/null

return_value=$?

# if the command succeeded (the user clicked continue)
# proceed with the backup
if [ $return_value = 0 ]; then
$BACKUP_SCRIPT
success=$?

# if the backup script succeeded then send mail to
# the user and schedule the next backup
if [ $success = 0 ]; then
echo "backup succeeded. scheduling next backup for"
echo $0 | at $BACKUP_TIME + $BACKUP_DAYS days
# the backup script failed so stop the backup loop
# and mail the user the failed message
else
echo "backup failed! stopping backup loop! please check your backup script and re-run this script!"
fi
# the backup has been skipped (user closed the window)
# so reschedule the backup for the next scheduled time
elif [ $return_value = 255 ]; then
echo "backup skipped. scheduling next backup for"
echo $0 | at $BACKUP_TIME + $BACKUP_DAYS days
# either the dialog command failed because X wasn't available
# or the user snoozed the backup, so reschedule the backup
else
echo $0 | at now + $SNOOZE_MINS minutes &> /dev/null
fi