Yahoo! Mobile provides a SyncML synchronization service to backup your contacts and calendar from any supported mobile device to Yahoo!

Here are the SyncML settings:

* ?Name? ? create a name to identify this synchronization profile (e.g. Yahoo)
* ?URL? ? the following address: ?sync.go.yahoo.com?
* ?User? Name ? enter your Yahoo! ID
* ?Password? ? enter your Yahoo! password
* ?Datapath? -
- ?Addressbook? ? enter ?contacts?
- ?Datebook? ? enter ?calendar?

From a previous post.