Where your app's data should live (and why region matters)
When you share an app, its data has to physically live somewhere. Here's why the region matters, for privacy, trust, and speed, and how to choose one.
When your app starts saving data, that data stops being abstract. It lives on real servers in a real place. Most people never think about where, until someone asks: “Where’s our data actually stored?” For a shared app, the answer matters more than you’d expect. Here’s why, and how to make a sensible choice.
The quick answer
Your app’s data should live in one region, close to your users, and stay there. On Backlit, every glow is pinned to a region you choose (Australia or the US), and its data isn’t copied across regions. Pick the region where your people are; that’s usually the whole decision.
Why “where” matters at all
It’s tempting to treat storage as a cloud with no location. But the physical region your data sits in affects three real things:
- Trust and expectations. People increasingly want to know their data stays in their country. “It’s stored in Australia” is a sentence that reassures Australian users and that you can say plainly when someone asks. Vagueness here reads as carelessness.
- Regulation. Depending on what you collect and who your users are, rules about where personal data may be stored and moved can apply. You don’t need to be a lawyer to benefit from a simple, honest answer: the data lives here and isn’t shipped elsewhere.
- Speed. Data served from near your users is faster than data fetched from the other side of the world. If your people are in Sydney, storing in Sydney feels snappier than storing in Iowa.
A shared app inherits all three the moment it saves its first byte.
The principle: pin it, don’t scatter it
The cleanest model for a small app is also the most reassuring: the data lives in one region and stays there. No quiet replication to other parts of the world, no “it’s somewhere in our global network.” One place, named, fixed.
That’s how Backlit works. When a glow is created it’s pinned to a region (both the app and its data), and Backlit doesn’t replicate user data across regions. If you chose Australia, it’s in Australia, full stop. That makes the answer to “where’s our data?” a single, honest sentence, which is exactly what you want to be able to give.
How the data is organised within a region
Region is the where; just as important is the how. Within your chosen region, Backlit keeps data separated so the right people see the right things:
- Per-user silos. Each signed-in person’s data is isolated, keyed to their verified email. One user can’t read another’s.
- Shared data. A common store the whole app can see, for the things everyone shares (a team board, a household list).
- Captures. A write-only store for form submissions, so a visitor can drop something in but can’t read everyone else’s entries back out.
So “where your data lives” has two layers: which region (geography) and which surface (who can see it). Getting both right is most of treating your users’ data responsibly.
How to choose a region
For almost everyone, it’s simple: pick the region closest to the people who’ll use the app.
- Users mostly in Australia or nearby? Choose the Australian region.
- Users mostly in the US or the Americas? Choose the US region.
- A bit of both? Choose where the majority, or the more sensitive data, sits, and know that it stays put rather than being mirrored.
You don’t need to over-think it. The point of pinning is that you make one clear choice and it holds.
What you should still do yourself
Region pinning and per-user isolation handle where and who-can-see-what. They don’t decide what you collect. That’s on you, and it’s the part that matters most for your users. Two habits cover most of it: collect only what the app actually needs, and tell people plainly what you’re storing. Good infrastructure makes those promises easy to keep; it can’t make them for you.
For a shared single-page app, you don’t need a data-governance program. You need a clear answer to “where does this live?” and confidence it won’t wander. Pin it to the right region, lean on per-user isolation, and you can answer that question in one sentence. Read the FAQ → or see how it works →.
Built an app with Claude or ChatGPT? Get early access to Backlit and share it in seconds.