On Mon, 7 Dec 2020 01:35:07 -0000 (UTC)
Martin Gregorie  wrote:

> Indeed, but this us a special case: the RPi boot process mounts the boot
> partition on /boot and any backup of '/' made on a running RPi with rsync
> *will* include the contents of the boot partition unless you've
> configured the rsync run to exclude /boot/* . Don't ask me how I know!

 Which is why all rsync based archive scripts should use the -x flag
to rsync which prevents crossing filesystem boundaries, it's not just /boot
you need to skip but *all* mounted filesystems.

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