alt Hacker News> GrapheneOS has built-in encrypted backup and restore.
The backup tool on GrapheneOS doesn't work for a large percentage of app data. And it often silently fails to backup some data, so you don't even know where the gaps are.
There have been promises of a better solution for years, but I haven't seen any movement yet.
This has gotten much better fairly recently ime. My backups to WebDAV work most of the time and when it fails I get notifications. But it was quite bad for a long time so I sympathize with your point