Trillian stores your buddy list and all your settings in your profile directory. First step is to locate your profile directory. It is either in the users folder in your Trillian folder (usually C:\Program Files\Trillian\users\) or in C:\Documents and Settings\Your Windows User\Trillian\User Settings\. In Windows Vista, the files are stored in C:\Users\Your Windows User\AppData\Local\VirtualStore\Program Files\Trillian\. In Trillian Astra, the profile directory is located in C:\Documents and Settings\Application Data\Trillian\users\ If you did not create a specific Trillian user profile, your profile is called default. Copy the complete profile directory, it contains your buddy list and all your settings.
Note: Trillian Astra already backups your buddy list and settings on the Astra server.
Trillian Auto Backup allows to backup your profile to a FTP server.