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Date: Sun, 23 Oct 2011 09:32:03 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Bill Tillman <btillman99@yahoo.com>
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Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject: Re: Need to Backup Using Dump
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On Sun, 23 Oct 2011, Bill Tillman wrote:

> I have two FreeBSD 8.2-STABLE servers running NFS. I have tons of files on Server A that I want to backup to a big drive on Sever B. Server B nfs_mounts one of the filesystems on Server A to /mnt. So if I wanted to make a backup of the filesytem on Server A to Server B I tried:
>
> dump -d /home/my_home/backups/20111024 /mnt
>
> but each time I try this it tells me that filesystem /mnt is unknown. /mnt is not in /etc/fstab. I manually mounted this via NFS and that's where all the files I want to backup are accessible to the command line on Server B. What am I missing?

dump(8) works on entire filesystems.  To copy directories, consider 
rsync.  To copy directories but put them into archives, there's tar and 
numerous others.