In your cloud sync app, you should be able to ask it to sync your camera folder - I know the nextcloud app asks if you want this, and you can also point it to specific folders to keep in sync.

If your self host cloud doesn’t have an app, just use https://play.google.com/store/apps/details?id=dk.tacit.android.foldersync.full to sync chosen folders.

Ahhh, just found this in the FAQ, sadly I think it’s not possible to backup app data using Shizuku.

https://swiftapps.org/faq#appparts

"The private app data in /data/data/ or /data/user/*/ that stores your app preferences, login info, databases, etc. This is the most important part to restore apps potentially with their state preserved.

Requirements: ⚠️ Root required for backup & restore ⚠️ Shizuku mode (ADB access) cannot read/write at these path"

Hold up… So are you saying that I could use Shizuku / Swiftbackup, and it would do backup and restore of app data, just like when I used to have root and Titanium Backup?! That would be a game changer, I never fully trusted Google backups or Samsung Smart Switch to do the full job.