Geovision 16 channel main DVR, about 10 or so (it can vary) cams connected at anyone time, but have more. Visimetrics 8 channel backup DVR for backup of main cams.
Some mobile DVRS which I will connect up when I get some spare time and a clear head. Lots of cams, from cheap b&w, to top end day/nights, and a ptz dome also.
Infra-red lighting (seperate, a uniflood led) out back, with spares for installing elsewhere, again when I get time and energy
Spare single channel dvr and multiplexor for emergency, or prolonged time away from house as a third backup.