Re: Phoneline Weakpoint
You can get routers that will fall-back to 3G dongles, etc, for business redundancy (e.g. several of the DrayTek models) so if you are really worries you should consider that. And also having images backed up to an external NAS/cloud in case the thief has the sense to nick the recorder as well. And proper alarms will also check the line is not dead for just that reason.