On Tue, Mar 23, 2021 at 12:50 AM Dave T <davestechs...@gmail.com> wrote:
> > d. Just skip the testing and try usebackuproot with a read-write
> > mount. It might make things worse, but at least it's fast to test. If
> > it messes things up, you'll have to recreate this backup from scratch.
> I took this approach. My command was simply:
>     mount -o usebackuproot /dev/mapper/xzy /backup
> It appears to have succeeded because it mounted without errors. I
> completed a new incremental backup (with btrbk) and it finished
> without errors.
> I'll be pleased if my backup history is preserved, as appears to be the case.
> I will run some checks on those backup subvolumes tomorrow. Are there
> specific checks you would recommend?

It will have replaced all the root nodes and super blocks within a
minute, or immediately upon umount. So you can just do a 'btrfs check'
and see if that comes up clean now. It's basically a kind of rollback
and if it worked, there will be no inconsistencies found by btrfs

Chris Murphy

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