[setishock]

If you set the amount of time you want it to run it will just record for that time. As for running over the old file and continue recording, I don't think it will. How ever you could set a routine for yourself that would have you at the home computer just prior to the time running out. If nothing of value happened on the recording you made, just delete the file and start a new one. If some thing did happen, and you want to keep it, you can close the recording and save the file. Just start a new one using a different file name. Date with the start time would make an easy to spot file name.

It did occure to me that if you could get your hands on a smaller dvr machine you can take the composit output from the vid card and feed it to the camera input on the dvr at home. Program its built in software to do what you want and just let it run.

The hotel I manage has some one at the front desk 24/7/365 so my hardware is relatively safe. However your question has me thinking I need to do some thing like that also. I'm looking to some PVR software but it's not free. In the mean time ME9 is working just fine.