> For the complete documentation index, see [llms.txt](https://developer.collibra.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.collibra.com/api/guides/import-api/synchronization/synchronization-of-existing-resources.md).

# Synchronization of existing resources

To start tracking already existing resources in Collibra, you have to include all the components of the system or resource for the first synchronization. This will allow the synchronization API to track the resources during future synchronizations.

{% hint style="info" %}
No resources are removed on an initial synchronization as there is no previous state for any resource identified by the new [synchronization ID](/api/guides/import-api/synchronization/synchronization-id.md).
{% endhint %}