[CyberShadow]

If your phone is rooted, you can use e.g. Linux Deploy to install a full Linux distribution. Then, you can set up regular ol' OpenSSH, mount /sys and /data under the Linux chroot, and rsync as usual.

I use this method to rsync to btrfs snapshots (+ raw copies of non-filesystem partitions) to make daily incremental backups of the entire phone. (Restoring said backups is a bit more involved, but I verified it's doable.)

[paulie_a]

I'd backup to a more reliable filesystem than btrfs. In my experience you will eventually randomly lose data with btrfs. I have lost all trust in it.

[CyberShadow]

Backups are by definition redundant, however, btrfs is still the only Linux filesystem with its featureset. Let me know when ZFS on Linux supports shrinking or cloning file ranges.

https://news.ycombinator.com/item?id=16494370

[dokument]

"raid" 1/0 and 10 are stable, others are not. Theoretically btrfs can protect against bit-rot where other fs's typically don't.

[paulie_a]

Theoretically that might be the goal. In my experience data melts away like butter on btrfs.