I run Ubuntu 11.10 with Thunderbird as main address book; I also have the thunderbird-couchdb package installed.

I know the U1 Contacts service status has not been working lately:

Contacts

2011-11-29 Syncing of contacts is not working for some users due to server issues. On 2011-10-10 we released an update to all clients
to help ease the load on the server and improve reliability of
syncing. We're now working on finishing up adding additional server
hardware.

, but I would like to start making my local contact couchdb database (so my main address book would not be TB one anymore), so it could be synced when the service restarts in a stable manner (and I could access to it from anywhere).
Here is the screenshot of my address books in TB:



In details I would like to:

• Understand if and where web address books (the ones with the globe icon) are stored in my fylesystem, so I can backup them;


• understand which web address book gets synced with U1 (surely it's the one named Ubuntu One, but I cannot get any useful property from TB)


• Copy (and not move) my TB contacts (the ones with the book icon) to the couchdb database that will get synced;


• Copy (and not move) my Google contacts to the couchdb database that will get synced;

Any step-by-step idea?
Thanks in advance!