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Date:      Sun, 12 Apr 2020 07:19:00 +0200
From:      Andrea Venturoli <ml@netfence.it>
To:        freebsd-questions@freebsd.org
Subject:   Re: Restoring and snapshots
Message-ID:  <2a0ee11a-eb32-7ae2-256f-ad1b00d1e49d@netfence.it>
In-Reply-To: <b80878d8-4a37-7f79-e94f-d3c44cb036bc@holgerdanske.com>
References:  <56b4e678-0e66-e65b-b9d2-a2e79a5b7b6f@netfence.it> <e8fb0530-917a-f259-9238-5306e63b89df@holgerdanske.com> <dbe79517-3d72-3af9-48df-129c7ec89bf7@netfence.it> <b80878d8-4a37-7f79-e94f-d3c44cb036bc@holgerdanske.com>

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On 2020-04-12 00:18, David Christensen wrote:

> I am confused:
> 
> *  What is the type of the filesystem that was the source of the backup?

ZFS in the example above, but I've got the same problem with UFS, as I 
also use snapshot there.



> *  What tool(s) did you use to backup?

Sometimes Bacula, sometimes some custom scripts.



> *  What is the type of the filesystem that was the destination of the 
> backup? 

Could be UFS, bacula volumes, tapes, ZIPs, etc...



> *  What tool(s) are you using to restore?

Again either Bacula or some custom scripts.




> *  What is the type of the filesystem that is the destination of the 
> restore?

Usually UFS or ZFS; could be something else.



> So, the backup source filesystem and the restore destination filesystems 
> are both ZFS (?).

Possibly, but not always.



> The upper Unix filesystem path should be an empty directory.

Should, but not always is.
Sometimes I found "forgotten" files in the directory which is the target 
of the nullfs mount. Of course those files are usually hidden and 
probably useless, but must be taken into account.



> I believe it is a result of the 'mountpoint' properties of the two ZFS 
> file systems and how ZFS represents filesystem snapshots in the Unix 
> file system.

No, this can happen with UFS too.




  bye & Thanks
	av.



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