I'm not deeply familiar with WA...where are the logs stored? If in the filesystem in plaintext ( /var/log (or a subdir)?), you can configure syslog-ng to send logs as they happen off box via a remote destination. Or, you can write a bash script to ftp/scp the files via a custom cron job (yes, you can do this). Caveats to any system changes NOT done in TMM: any hotfix/upgrade will blow your configuration away, so make sure you document and archive your configuration for rebuild after either of these occurrences. The wiki has backup scripts (like this one:
Click Here) that you could easily alter for ftp/scp'ing of log archives.
HTH...Jason