Two-Way Sync vs One-Way Sync
When two systems share data, you have to decide which direction changes flow. A one-way sync copies changes from a source to a destination; a two-way sync keeps both sides in step. The right choice avoids a great deal of confusion.
This article explains the difference and how to choose the approach that suits your situation.
The Two Patterns
Each pattern fits a different relationship between your systems.
- One-way: one system leads, the other simply follows.
- Two-way: changes in either system appear in both.
- Source of truth: the system that wins when there is a clash.
- Conflict rules: how simultaneous edits are resolved.
Choosing Between Them
Simpler is usually safer unless both sides genuinely need to lead.
- Use one-way when a single system owns the data.
- Use two-way only when both must accept changes.
- Define the source of truth before building.
- Plan clearly for conflicts in a two-way sync.
| Sync type | Complexity | Best for |
|---|---|---|
| One-way | Lower | Clear single owner of the data |
| Two-way | Higher | Both systems must stay editable |
If you need a hand with any of this, your Progressive Robot delivery team is ready to help. Raise a ticket from the Support area of your client portal or speak to your account manager and we will guide you through the next steps.