Do you have shell access? If so, you could schedule it as a cron job.
Depending on your distro, it might go something like this...
At the command line, type
This will open the cron table in an editor, like vi or nano or something. Then add this line:
* 2 * * * /path/to/script/scriptname
This would run the script at 2 AM every day. For help on cron jobs, Google "cron tutorial".
Hope that helps.