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?
Entries are stored in a SQLite database, and uploaded images sit on disk under the configured DATA_DIR. Both are in a single Docker volume.
Since this is largely/almost entirely for private data with occasional publicly accessible content through share links, this is a good candidate to be rebased onto remoteStorage, which gives you auth and storage for free, and there's always an escape hatch for the user to have access to their data—and permit other apps to access it, too.
<https://remotestorage.io/>