I do something similar, org in Dropbox, with todo list in one file and "engineering journal" in another. But I just create the journal entries as needed (often

I do something similar, org in Dropbox, with todo list in one file and "engineering journal" in another. But I just create the journal entries as needed (often for meeting notes) with function that creates opens the journal buffer and narrows it to a single new timestamped entry. I see there's now a package https://www.emacswiki.org/emacs/OrgJournal https://www.emacswiki.org/emacs/OrgJournal for this kind of thing.