reveiled

There are 45 cameras in my office and when they were installed 5-6 years ago we had 3 16 channel DVRs from Bosch. Now we have one dead DVR, One on it's way out and only one working properly. We're looking to replace all 3 DVR with DVRs. No need for NVR. All our cameras terminate with BNC connectors. What we're looking for: Over 10 days of storage. * more is better Mac/Apple native Software *important Remote accessibility Mobile application and controller to switch between cameras. What system, company you would recommend? PS: Native Mac software important as our office only use Apple computers. That was one problem with our Bosch unit after we switch to Apple. Storage: we had up to 7 days. Not sure what size HDD they had but we're open to maybe 20 days of storage. What TB size would be sufficient? Rack mountable standalone system preferable. If there are vendors here, I'm open to taking quotes as well. Thank you

Would you recommend going with a 48 channel DVR? Does that even exist? Dahua seems to be a company located outside the US Have you used them before? Concerned about warranty & service.