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+<!DOCTYPE HTML PUBLIC "-//Norman Walsh//DTD DocBook HTML 1.0//EN">
+<HTML
+><HEAD
+><TITLE
+>Selecting the backup tool</TITLE
+><META
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+CONTENT="Modular DocBook HTML Stylesheet"><LINK
+REL="HOME"
+TITLE="The Linux System Administrators' Guide"
+HREF="book1.html"><LINK
+REL="UP"
+TITLE="Backups"
+HREF="c2187.html"><LINK
+REL="PREVIOUS"
+TITLE="Selecting the backup medium"
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+TITLE="Simple backups"
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+><DIV
+CLASS="NAVHEADER"
+><TABLE
+WIDTH="100%"
+BORDER="0"
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+><TR
+><TH
+COLSPAN="3"
+ALIGN="center"
+>The Linux System Administrators' Guide</TH
+></TR
+><TR
+><TD
+WIDTH="10%"
+ALIGN="left"
+VALIGN="bottom"
+><A
+HREF="x2206.html"
+>Prev</A
+></TD
+><TD
+WIDTH="80%"
+ALIGN="center"
+VALIGN="bottom"
+>Chapter 10. Backups</TD
+><TD
+WIDTH="10%"
+ALIGN="right"
+VALIGN="bottom"
+><A
+HREF="x2240.html"
+>Next</A
+></TD
+></TR
+></TABLE
+><HR
+ALIGN="LEFT"
+WIDTH="100%"></DIV
+><DIV
+CLASS="SECT1"
+><H1
+CLASS="SECT1"
+><A
+NAME="AEN2216"
+>Selecting the backup tool</A
+></H1
+><P
+> There are many tools that can be used to make
+	backups.  The traditional UNIX tools used for backups
+	are <B
+CLASS="COMMAND"
+>tar</B
+>, <B
+CLASS="COMMAND"
+>cpio</B
+>, and
+	<B
+CLASS="COMMAND"
+>dump</B
+>.  In addition, there are large number
+	of third party packages (both freeware and commercial) that
+	can be used.  The choice of backup medium can affect the choice
+	of tool.  </P
+><P
+> <B
+CLASS="COMMAND"
+>tar</B
+> and <B
+CLASS="COMMAND"
+>cpio</B
+> are
+	similar, and mostly equivalent from a backup point of view.
+	Both are capable of storing files on tapes, and retrieving
+	files from them.  Both are capable of using almost any media,
+	since the kernel device drivers take care of the low level
+	device handling and the devices all tend to look alike to user
+	level programs.  Some UNIX versions of <B
+CLASS="COMMAND"
+>tar</B
+>
+	and <B
+CLASS="COMMAND"
+>cpio</B
+> may have problems with unusual files
+	(symbolic links, device files, files with very long pathnames, and
+	so on), but the Linux versions should handle all files correctly.
+	</P
+><P
+> <B
+CLASS="COMMAND"
+>dump</B
+> is different in that it reads
+	the filesystem directly and not via the filesystem.  It is
+	also written specifically for backups; <B
+CLASS="COMMAND"
+>tar</B
+>
+	and <B
+CLASS="COMMAND"
+>cpio</B
+> are really for archiving files,
+	although they work for backups as well.  </P
+><P
+> Reading the filesystem directly has some advantages.
+	It makes it possible to back files up without affecting their time
+	stamps; for <B
+CLASS="COMMAND"
+>tar</B
+> and <B
+CLASS="COMMAND"
+>cpio</B
+>,
+	you would have to mount the filesystem read-only first.
+	Directly reading the filesystem is also more effective, if
+	everything needs to be backed up, since it can be done with
+	much less disk head movement.  The major disadvantage is that
+	it makes the backup program specific to one filesystem type;
+	the Linux <B
+CLASS="COMMAND"
+>dump</B
+> program understands the ext2
+	filesystem only.  </P
+><P
+> <B
+CLASS="COMMAND"
+>dump</B
+> also directly supports
+	backup levels (which we'll be discussing below); with
+	<B
+CLASS="COMMAND"
+>tar</B
+> and <B
+CLASS="COMMAND"
+>cpio</B
+> this has to
+	be implemented with other tools.  </P
+><P
+> A comparison of the third party backup tools is beyond
+	the scope of this book.  The Linux Software Map lists many of
+	the freeware ones.  </P
+></DIV
+><DIV
+CLASS="NAVFOOTER"
+><HR
+ALIGN="LEFT"
+WIDTH="100%"><TABLE
+WIDTH="100%"
+BORDER="0"
+CELLPADDING="0"
+CELLSPACING="0"
+><TR
+><TD
+WIDTH="33%"
+ALIGN="left"
+VALIGN="top"
+><A
+HREF="x2206.html"
+>Prev</A
+></TD
+><TD
+WIDTH="34%"
+ALIGN="center"
+VALIGN="top"
+><A
+HREF="book1.html"
+>Home</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
+VALIGN="top"
+><A
+HREF="x2240.html"
+>Next</A
+></TD
+></TR
+><TR
+><TD
+WIDTH="33%"
+ALIGN="left"
+VALIGN="top"
+>Selecting the backup medium</TD
+><TD
+WIDTH="34%"
+ALIGN="center"
+VALIGN="top"
+><A
+HREF="c2187.html"
+>Up</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
+VALIGN="top"
+>Simple backups</TD
+></TR
+></TABLE
+></DIV
+></BODY
+></HTML
+>
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