When the year changes, last year's diary entries are no longer shown on the list screen.
Please tap the button at the top left of the list screen and switch the year (do the same if you see the message "No diary entries for this year yet. (You can change the year from the top left.)").
There have been no reports of data suddenly disappearing, but if that ever happens, please contact us using the "Contact Us" button on the help screen. Thank you.
※ If you uninstall (delete) the app, the data inside the app is deleted as well. It can be restored after reinstalling only if you had created a "Google Drive backup".