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?

German shepherds shouldn’t be bred at all. They have genetic defects that make them suspect to certain illnesses, such as hip defects. Don’t buy them. They will suffer and you will have an expensive vet bill.