the db files are located in: /home/user/.rtcom-eventlogger
hm. via USB, i think, you only can read the MyDocs-dir, or not? well, so you can use a connection via wifi, oder network. for example, you can upload the file with a ftp-client to a server, and download it on the PC.. or you install ssh-server on the n900, and an sftp-client on the pc... not as easy :-)