I used memos which has similar feature set. One day I lost my hard drive and I had to restore from s3. Turns out the backup I had was incompatible with latest version of memos app.
Since then I just gave up on web based tools for notes. I just want to save my notes and be able to recover them when things go wrong. A simple directory with markdown files and hugo blog allows me to do that.
OP how does your app store the journal entries?