Check backup time - NRPE backup completion check

My backup solution updates the timestamp of the file /var/backups/tykbackup_complete_timestamp after a successful backup has been completed. I make NRPE check the age of that file, if it gets more than 25 hours old it throws a warning, more than 50 hours old it goes critical. I add the following to /usr/local/etc/nrpe.cfg:

command[check_backup_time]=/usr/local/libexec/nagios/check_file_age -w 90000 -c 180000 -f /var/backups/tykbackup_complete_timestamp