> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mantrixflow.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Sync state

> Understand how Incremental runs store and reuse checkpoint state.

Sync state is the checkpoint MantrixFlow saves after a successful Incremental run.

The runner extracts state before deleting temporary staging files. The platform persists that checkpoint so later Incremental runs can resume.

## When state matters

State matters when:

* a destination uses `INCREMENTAL`
* a schedule is active
* you change the replication key
* you are investigating missing or duplicated rows

## Operational guidance

* Do not change replication keys casually after a pipeline is running.
* Validate a manual run after any sync-mode or replication-key change.
* Treat state resets as operational recovery work.

Full Table runs do not depend on checkpoint state for scheduling because they are manual-only in the current app.