Hybrid PACS: Why Keystone Gives You Local Speed and Cloud Access Without Choosing Between Them

The cloud vs. on-premise PACS debate is often framed as a choice. It doesn’t have to be. Most clinics want fast local image loading and remote access from home. They want offline reliability and cloud backup. They want control of their data and the flexibility to share with specialists. A hybrid architecture gives you all of that. It’s why Keystone Omni is built around it.

What hybrid PACS actually means

A hybrid PACS keeps a local server or workstation running at your clinic — handling image acquisition, storage, and viewing without depending on internet speed — while also syncing to cloud infrastructure for backup, remote access, and sharing.

In plain terms: your images live on-site and in the cloud at the same time. You get local performance on fast days and cloud access on late nights. You don’t have to pick one and live with the trade-offs of the other.

The problem with going all-in on cloud

Cloud PACS gets a lot of deserved attention. Easier setup, no servers to maintain, instant remote access, automatic backups. For many clinics, it’s exactly right.

But there’s a real-world limit: your internet connection.

Most veterinary clinics don’t run on enterprise-grade fibre. If your connection drops, slows during peak hours, or struggles with the file sizes that come with CT or MRI studies, a pure cloud system creates friction exactly when you need speed most. You’re between patients, you need the prior study, and you’re watching a loading bar.

Local storage solves this. Images acquired from your modality go directly to a local server, available instantly, regardless of what the internet is doing.

The problem with going all-in on on-premise

On-premise PACS gives you full local control and fast access to your own images. But it creates problems the moment you need to operate outside that server room.

• Reviewing a case from home requires a VPN, a workaround, or just not doing it.
• Sharing a study with a teleradiology partner means exporting files, emailing attachments, or burning a disc.
• If the server fails, floods, or burns, your imaging archive goes with it unless you’ve set up manual off-site backups.
• Scaling up means buying hardware.

On-premise can be the right call for clinics with dedicated in-house IT and strict offline requirements. For most independent practices, it’s an overhead cost that doesn’t pay for itself.

How Keystone’s hybrid architecture works

Keystone Omni is built on a hybrid model: a local Keystone server receives and stores images as they come in from your modalities, and that same data syncs automatically to Asteris’s cloud infrastructure.

Here’s what that means in practice:

Who hybrid fits

The honest answer is: most clinics.

Small animal general practice gets fast in-clinic viewing plus the ability to share studies for teleradiology consults without needing IT support on staff.

Specialty and referral hospitals get local performance for high-volume imaging days plus cloud sharing for multi-doctor access and on-call review.

Multi-location practices get a single cloud-accessible archive across all sites, without the complexity of linking separate on-premise servers via VPN.

Equine and large-animal practices benefit from the cloud side — field vets can pull prior studies on mobile devices between farm calls, without needing to be in the clinic.

The cases where a different architecture makes more sense are narrow: a practice with truly dedicated in-house IT, strict data sovereignty requirements, and very stable workflows might prefer on-premise only. A brand-new single-location clinic with no imaging history might start with pure cloud. But for most independent veterinary practices in 2026, hybrid is the architecture that doesn’t make you compromise.

What to ask when you evaluate any PACS

If you’re comparing systems, ask these directly — the answers tell you whether a system is actually hybrid or just marketing itself as flexible:

1. Does the system store images locally as well as in the cloud, or is it entirely dependent on internet access?
2. What happens to my workflow if the internet is slow or down?
3. Can I access images from outside the clinic without a VPN?
4. How does the system handle teleradiology submissions — from inside the PACS, or by exporting to another system?
5. What are the backup and disaster recovery arrangements?
6. How does file size affect transfer speed and storage costs?

The short version

Cloud gives you access. On-premise gives you speed. Hybrid gives you both, without making you choose which one matters more on a given day.

Keystone Omni is built around that architecture because most veterinary practices need it. Local performance for the clinical team, cloud access for after-hours review and sharing, encrypted redundancy for the imaging archive that took years to build.