This thread is probably stale, but the question now becomes, what is the most relatively painless way to backup with a non-rooted, locked bootloader phone? I’ve also had a hardware issue (now addressed) on my FP3 and had to contact support before, so I’m not willing to go in this direction until my warranty expires. When the time comes, I’d like to have a more reasonable backup of my phone and its data to make the transition to more open software as painless as possible 
However, I’ve seen mixed reviews with basically every backup method I’ve seen has substantial drawbacks
- DB seems that it does not save everything, and its restore function has been documented to malfunction
- Helium Backup does not seem to have high reviews.
- Built-in Google Backup requires extra space available on cloud storage.
The following list has many solutions, but my impression from going through many of them, is that they all are incomplete…
So, I suppose I’m reaching out. If you have an unrooted, locked bootloader phone, what has your solution to phone backup been?