@larsivi I’m guessing you’re asking about the android app, so I have no direct knowledge, though I think you can periodically email yourself the log file or something equally manual.
I answer almost all of my pings on a computer, so don’t have to transfer the log files to a computer. I’ve put my tagtime directory inside of dropbox, so they end up together on the particular computer where I run the sync script.
Elsewhere I’ve described how I semi-automate tagtime for iOS, which may be useful.