Cloud VMS vs on-premise VMS

Side by side

How does an on-premise VMS work?

An on-premise VMS keeps everything inside the building. A server or recorder on the local network takes a stream from each camera, writes it to local disks under a retention window sized by the disks, and shows live views and playback to operators on that network.

Its strengths follow from that placement. It needs no internet link to record or to view, footage never leaves the site unless someone exports it, and the same server can be wired to door controllers and alarm panels so events from one appear next to video from another. Its costs follow too: the hardware is bought and sized up front, each site is its own installation with its own disks to replace and software to patch, and anyone outside the building reaches it through a VPN or a forwarded port.

How does a cloud VMS work?

A cloud VMS moves the server out of the building. Each camera streams to the provider over the internet, the provider stores the footage under a retention window the account sets, and every user reaches live views, playback, alerts and settings from a browser with nothing installed on site.

On Camzify, recording runs continuously or on a schedule per camera, with retention set per camera in days or as a storage cap from a pool sold per terabyte, so a camera on a loading dock can keep footage longer than one in a corridor. The 23 AI detections run in the cloud on confirmed object tracks from the same streams, and the scheduled virtual patrol rounds run there too, so a site adds detection and rounds without adding a GPU or a server. Every site sits on one account with sub-users scoped to their own sites, which is what turns a portfolio of recorders into one console.

What the cloud model asks of the site is a path for the streams. A camera already reachable over the internet connects directly by RTSP, RTMP or HTTPS; a camera on a private network connects through the Camzify Connector, an application on a PC that reaches both the cameras and the internet and relays the streams outward, without port forwarding and without exposing a camera.

Where on-premise is the better choice

On-premise is the better choice when the footage cannot leave the building, when the site cannot carry its streams to the internet, or when recording must continue with the internet down. None of these is solved by a cloud system, and a site with any of them should keep its recorder.

• Footage may not leave the building. A policy, a contract or a regulator that requires recordings to stay on site is met by a recorder on the local network, and a cloud system cannot meet it by definition.
• The site has no usable upload bandwidth. Every stream a cloud VMS records has to be carried to the internet for as long as it records; a recorder takes the same streams over the local network and needs no internet at all.
• Recording has to continue through an internet outage. A recorder on the local network keeps writing while the link is down, and a cloud system cannot receive what the site cannot send.
• The operators sit at a wall of monitors on the site network. Local viewing of many cameras at full quality is the recorder at its best, with nothing in the path but the switch.
• Video must be tied to doors, alarm panels and building systems in one console. Those integrations are what an on-premise VMS is built for, and they run on the same network as the panels.

Where a cloud VMS is the better choice

A cloud VMS is the better choice when there are several sites, when people outside the building need to see the cameras, or when nobody wants to own and maintain a server. The cloud VMS guide covers the model in more depth, and the Blue Iris alternative page walks through the move from a recording PC on site.

• There is more than one site. A cloud VMS puts every site on one account and one console, with sub-users scoped to their own sites, instead of one server per building and a VPN between them.
• People outside the building need the cameras. Guards, an agency or a monitoring company reach a cloud VMS from a browser with a permission group deciding what they see; nobody opens a port or issues VPN credentials.
• The recording has to survive the recorder. Footage in the cloud is still there when the equipment room is flooded, burgled or unplugged, which is exactly when it is needed.
• Nobody wants to own a server. Updates, disk replacement, capacity planning and the operating system are the provider's job, and adding cameras is adding cameras, not buying a bigger box.
• Detection and rounds have to run without a GPU on site. A cloud VMS runs its AI detections and its scheduled patrol rounds in the cloud, on the cameras a site already owns, with nothing installed but an optional connector.

Can cloud and on-premise run together?

Yes, and for a site that already owns a working recorder this is the usual arrangement. The recorder keeps taking its stream and holding the local archive, and the cloud system takes its own stream from the same camera, records a copy under its own retention, and runs the detections and rounds. The recorder answers the outage and the footage-stays-on-site requirements; the cloud answers the remote access, multi-site and verification requirements.

The hybrid cloud video surveillance guide sets out how to split the two, and the cloud video surveillance page describes the cloud side on its own.

The bottom line

Neither approach is universally better. The right choice depends on where the footage is allowed to live, what the site can send upstream, how many sites there are and who needs to reach them. Virtual patrolling is strongest where consistency, audit trails and cost against guard hours matter most: multi-site operations, after-hours coverage, and facilities where guarding is the dominant security spend, all of which are cases the cloud model serves and a recorder per site does not.

For the definitions behind this comparison, read what a cloud VMS is; for the cost side, what drives cloud VMS cost. Use the ROI calculator to model the cost comparison for your specific scenario, or review pricing to understand the per-instance licensing model. The cloud video surveillance page describes the cloud side on its own.