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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta name="generator" content="HTML Tidy, see www.w3.org" /><title>Backups to Floppies</title><meta name="GENERATOR" content="Modular DocBook HTML Stylesheet Version 1.7" /><link rel="HOME" title="FreeBSD 使用手册" href="index.html" /><link rel="UP" title="Storage" href="disks.html" /><link rel="PREVIOUS" title="Creating and Using Data Tapes"href="backups-tapebackups.html" /><link rel="NEXT" title="Backup Basics" href="backup-basics.html" /><link rel="STYLESHEET" type="text/css" href="docbook.css" /><meta http-equiv="Content-Type" content="text/html; charset=GB2312" /></head><body class="SECT1" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#840084"alink="#0000FF"><div class="NAVHEADER"><table summary="Header navigation table" width="100%" border="0" cellpadding="0"cellspacing="0"><tr><th colspan="3" align="center">FreeBSD 使用手册</th></tr><tr><td width="10%" align="left" valign="bottom"><a href="backups-tapebackups.html"accesskey="P">Prev</a></td><td width="80%" align="center" valign="bottom">Chapter 12. Storage</td><td width="10%" align="right" valign="bottom"><a href="backup-basics.html"accesskey="N">Next</a></td></tr></table><hr align="LEFT" width="100%" /></div><div class="SECT1"><h1 class="SECT1"><a id="BACKUPS-FLOPPYBACKUPS" name="BACKUPS-FLOPPYBACKUPS">12.8.Backups to Floppies</a></h1><div class="SECT2"><h2 class="SECT2"><a id="FLOPPIES-USING" name="FLOPPIES-USING">12.8.1. Can I Use Floppiesfor Backing Up My Data?</a></h2><p>Floppy disks are not really a suitable media for making backups as:</p><ul><li><p>The media is unreliable, especially over long periods of time.</p></li><li><p>Backing up and restoring is very slow.</p></li><li><p>They have a very limited capacity (the days of backing up an entire hard disk onto adozen or so floppies has long since passed).</p></li></ul><p>However, if you have no other method of backing up your data then floppy disks arebetter than no backup at all.</p><p>If you do have to use floppy disks then ensure that you use good quality ones.Floppies that have been lying around the office for a couple of years are a bad choice.Ideally use new ones from a reputable manufacturer.</p></div><div class="SECT2"><h2 class="SECT2"><a id="FLOPPIES-CREATING" name="FLOPPIES-CREATING">12.8.2. So How Do IBackup My Data to Floppies?</a></h2><p>The best way to backup to floppy disk is to use <span class="CITEREFENTRY"><spanclass="REFENTRYTITLE">tar</span>(1)</span> with the <var class="OPTION">-M</var> (multivolume) option, which allows backups to span multiple floppies.</p><p>To backup all the files in the current directory and sub-directory use this (as <ttclass="USERNAME">root</tt>):</p><pre class="SCREEN"><samp class="PROMPT">#</samp> <kbd class="USERINPUT">tar Mcvf /dev/fd0 *</kbd></pre><p>When the first floppy is full <span class="CITEREFENTRY"><spanclass="REFENTRYTITLE">tar</span>(1)</span> will prompt you to insert the next volume(because <span class="CITEREFENTRY"><span class="REFENTRYTITLE">tar</span>(1)</span> ismedia independent it refers to volumes; in this context it means floppy disk).</p><pre class="SCREEN">Prepare volume #2 for /dev/fd0 and hit return:</pre><p>This is repeated (with the volume number incrementing) until all the specified fileshave been archived.</p></div><div class="SECT2"><h2 class="SECT2"><a id="FLOPPIES-COMPRESS" name="FLOPPIES-COMPRESS">12.8.3. Can ICompress My Backups?</a></h2><p>Unfortunately, <span class="CITEREFENTRY"><spanclass="REFENTRYTITLE">tar</span>(1)</span> will not allow the <varclass="OPTION">-z</var> option to be used for multi-volume archives. You could, ofcourse, <span class="CITEREFENTRY"><span class="REFENTRYTITLE">gzip</span>(1)</span> allthe files, <span class="CITEREFENTRY"><span class="REFENTRYTITLE">tar</span>(1)</span>them to the floppies, then <span class="CITEREFENTRY"><spanclass="REFENTRYTITLE">gunzip</span>(1)</span> the files again!</p></div><div class="SECT2"><h2 class="SECT2"><a id="FLOPPIES-RESTORING" name="FLOPPIES-RESTORING">12.8.4. How Do IRestore My Backups?</a></h2><p>To restore the entire archive use:</p><pre class="SCREEN"><samp class="PROMPT">#</samp> <kbd class="USERINPUT">tar Mxvf /dev/fd0</kbd></pre><p>There are two ways that you can use to restore only specific files. First, you canstart with the first floppy and use:</p><pre class="SCREEN"><samp class="PROMPT">#</samp> <kbd class="USERINPUT">tar Mxvf /dev/fd0 <varclass="REPLACEABLE">filename</var></kbd></pre><p>The utility <span class="CITEREFENTRY"><spanclass="REFENTRYTITLE">tar</span>(1)</span> will prompt you to insert subsequent floppiesuntil it finds the required file.</p><p>Alternatively, if you know which floppy the file is on then you can simply insert thatfloppy and use the same command as above. Note that if the first file on the floppy is acontinuation from the previous one then <span class="CITEREFENTRY"><spanclass="REFENTRYTITLE">tar</span>(1)</span> will warn you that it cannot restore it, evenif you have not asked it to!</p></div></div><div class="NAVFOOTER"><hr align="LEFT" width="100%" /><table summary="Footer navigation table" width="100%" border="0" cellpadding="0"cellspacing="0"><tr><td width="33%" align="left" valign="top"><a href="backups-tapebackups.html"accesskey="P">Prev</a></td><td width="34%" align="center" valign="top"><a href="index.html"accesskey="H">Home</a></td><td width="33%" align="right" valign="top"><a href="backup-basics.html"accesskey="N">Next</a></td></tr><tr><td width="33%" align="left" valign="top">Creating and Using Data Tapes</td><td width="34%" align="center" valign="top"><a href="disks.html"accesskey="U">Up</a></td><td width="33%" align="right" valign="top">Backup Basics</td></tr></table></div></body></html>⌨️ 快捷键说明
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