A bucket that quietly triples in size costs you twice — once on the storage bill, and once in the time it takes to notice. On the Business plan, buckets can now tell you.

Open a bucket, go to the Alerts tab, and set a threshold:

• •Size, in GB — works with every storage provider.
• •Estimated cost, in dollars per month — available wherever we can price the storage.

Add as many as you need. Escalating thresholds are the point: $20, then $40, then $80. When several are set you hear about the highest one you've passed, not all of them — a bucket at $45 tells you it's over $40, not also over $20, which you already knew. Cross a higher one and you're told straight away.

You get an email when a bucket goes over, then once a day while it stays over. Drop back under and the alert resets itself, so the next crossing is reported immediately rather than a day later. Alerts go to workspace admins, and anyone can turn the emails off for themselves in Settings → Notifications.

Two things worth knowing. Alerts read the same index the rest of the app uses, so a bucket that hasn't been indexed yet has nothing to measure — the tab says so instead of showing you a zero. And the cost figure is an estimate of storage: your indexed data at the region's per-GB rate. It doesn't include request, transfer or retrieval charges, so it won't match your provider's invoice exactly. It's there to catch a bucket running away, not to reconcile a bill.

Full details in Size & cost alerts.