kmail: all mail folder are missing

Hello,

by canceling a kmail 4.8.5 resource in system control of KDE 4.8.5 on a 
linux box with opensuse 12.2 kmail terminated.
After this all mail-folder and current mails are missing.

Until now I thougt my mail an mail-folder were located in 
/home/user/Mail. In this folder tere are actually a lot of mails and 
folders but only until year 2012.

Where do I find the configured mail-folder of kmail?

Is loss of all mails in this situation possible?
Searching the filesystem does not help.

After termination of kmail new mail and new mail-folders are now located 
in ~/.local/share/local-mail, possible the standard folder.

What to do to find my older mails?

There is a 3 days old backup file present. Which folder an files are to 
restore?

--
Dirk