How do I synchronize my contacts with Synology CardDAV server?

Enable the CardDAV server feature on your Synology NAS and find out the CardDAV address. Here the manufacturer describes how this works.

Make sure that sync.blue® can reach your Synology via Internet (e.g. via Dynamic DNS with the provider ddnss.de).

Create a new connection in sync.blue® and select "CardDAV" as source or destination.

Store the URL to your CardDAV address book on your Synology device there. Example:

https://meine-firma.ddnss.de:5001/carddav/Max%20Mustermann/XXXa4862-d8f8-413b-910d-303efc25eXXX/

or

https://meine-firma.ddnss.de:5001/carddav/mustermann

The use of QuickConnect-IDs is not supported!