Export as ZIP and copy it manually using USB-connection from /sdcard/kellermeister to a safe place (e.g. your PC)
- Export ZIP and send it via "Share cellar" to your preferred application, e.g. Mail, Google Drive or Dropbox
- Export CSV and send it via "Share cellar" to your preferred application, e.g. Mail, Google Drive or Dropbox. Please keep in mind that CSV is technically not able to store images.
- Synchronize data to the Kellermeister backend. Even if you are not planning to share data between devices you now have a backup at hand if you are switching to a new device.
Option 4. is my favourite ;)
[Update 09/16/2021] ad 1.: Since Android 10 and later ZIP and CSV archives are no longer available at /sdcard/kellermeister. Please consider remaining options.