I’ve been running this for years and it’s great. Does what it says and it’s really awesome to have a tool like that

It’s a real problem and it does happen. Stop blaming users for bad software

You should at least play around with the export options and do regular exports. You really don’t want your diary of over 5 years to be stuck in an unmaintained app. And since this seems to be supporting exporting into markdown - maybe try an export and checkout logseq or Obsidian?