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About every hour, automatically. Each sync picks up new documents, changed content, deletions, and permission changes from the original system. To update a source right now, open its three-dot menu and choose Re-sync. Syncs are incremental for most sources: Brain processes and bills only new or changed documents, so routine hourly syncs are fast and usually free. Direct file uploads never sync on a schedule. They only change when you add or remove files. You can follow progress on the source’s row and page: Each source’s page also keeps a history of past sync runs. When you run a sync manually, Brain emails you if it fails. If it succeeds, Brain only emails you when the sync ran long enough that you have probably stopped watching the page. Automatic scheduled syncs don’t send success emails.

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FAQ

Not from the product today. If hourly is too frequent for a source, pause it and Re-sync manually when you want updates. For anything else, contact support.
Only when it finds new or changed documents. Unchanged documents are never re-indexed or re-billed.
A sync is already running, or the source is still a draft awaiting estimate approval.
On the next sync of that source — within the hour, or immediately after a manual Re-sync.

Why did my sync fail?

Failure reasons and fixes

When do permission changes show up?

Sync timing for access changes