Question: Why is it recommended to mount `subvolid=5` when backing up `/`?
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Description
The README states:
> Mounting subvolid=5 is recommended (mandatory for btrbk < v0.32.0) if you want to backup your root filesystem /.
I assume "root filesystem /" here refers to the OS root, not the top-level subvolume.
Why is it recommended to do that? I.e., why is it recommended against doing:
```
snapshot_dir /mnt/snapshots
subvolume /
```
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