# Copy

A copy migration is the process of copying Mautic resources from one instance to another.

The instance you copy from is referred as the source instance, the one you copy to is the target.

Copying is non-destructive and follows these principles:

• Resources that only exist in the source are created on the target;
• Resources that already exist in the target are updated;
• Resources that only exist in the target are left as-is (not deleted);

To copy resources click on Migration in the navigation menu on the left and then click on the Create Copy button in the top right corner of the page.

Select the source and target instances, the resource types you want to copy and then click Create.

A new entry will be added to the table where you can track its progress.

If the migration fails you can click on the gearbox icon next to it and click on Retry to re-run it. If it fails again you should consider reaching out to: [email protected].

Don't worry, even if only some resources failed to copy, the ones that were copied will be skipped.

Once the migration completes and you no longer need it, delete it by clicking the gearbox icon next to it and click on Delete.