Askozia's package system defines a special folder, 'data', which allows files to be persistant when package updates are applied. The inetd package's ftp and tftp root folders, dropbear keys, crontab and startup scripts are stored within this folder.
but where do I find the tftp-folder?
The path you're looking for is /storage/inetd.pkg/data/srv/tftp
I'm glad you've found the inetd package useful.
devon