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I’ve disabled network access to Nova on a stock Android phone with NetGuard https://netguard.me/

And if you worry about how to update NetGuard automatically you can do it with Obtainium

Various HDD full data backups maintained with FreeFileSync, important files backup on ProtonDrive. Multi-device autosync with Syncthing (phones, tablet, pcs)

Use FreeFileSync to make your backups easily without having to copy everything by yourself, thank me later!

I’m also interested in this, I use Syncthing for multi-device sync, but it’s not aimed for multi-directoy in a single device backup

But, syncthing does not allow single-device synchronization, is a multi-device sync app