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Absolute FreeBSD, 2nd Edition by Michael W. Lucas

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dump

dump(8) is a disk-block backup tool. In some ways, it looks similar to tar(1), but the significant difference is that dump is aware of the underlying filesystem and takes advantage of the filesystem layout. We'll talk more about filesystems in Chapter 8, but for now, all you need to know is that a filesystem is the scheme by which zeroes and ones are arranged on the physical hard drive. dump is specifically integrated with FreeBSD's UFS2 filesystem. New sysadmins aren't as likely to be familiar with dump as with tar, but dump is more efficient and safer than tar. When you have a choice, use dump. [16]

One drawback of dump is that it works on filesystems, not on files. You can't dump /etc unless you want to dump all of the root partition. You ...

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