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diff --git a/sag-0.6.1-www/sag-0.6.1.html/x2206.html b/sag-0.6.1-www/sag-0.6.1.html/x2206.html new file mode 100644 index 0000000..39d7063 --- /dev/null +++ b/sag-0.6.1-www/sag-0.6.1.html/x2206.html @@ -0,0 +1,178 @@ +<!DOCTYPE HTML PUBLIC "-//Norman Walsh//DTD DocBook HTML 1.0//EN"> +<HTML +><HEAD +><TITLE +>Selecting the backup medium</TITLE +><META +NAME="GENERATOR" +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="Backups" +HREF="c2187.html"><LINK +REL="NEXT" +TITLE="Selecting the backup tool" +HREF="x2216.html"></HEAD +><BODY +BGCOLOR="#FFFFFF" +TEXT="#000000" +><DIV +CLASS="NAVHEADER" +><TABLE +WIDTH="100%" +BORDER="0" +CELLPADDING="0" +CELLSPACING="0" +><TR +><TH +COLSPAN="3" +ALIGN="center" +>The Linux System Administrators' Guide</TH +></TR +><TR +><TD +WIDTH="10%" +ALIGN="left" +VALIGN="bottom" +><A +HREF="c2187.html" +>Prev</A +></TD +><TD +WIDTH="80%" +ALIGN="center" +VALIGN="bottom" +>Chapter 10. Backups</TD +><TD +WIDTH="10%" +ALIGN="right" +VALIGN="bottom" +><A +HREF="x2216.html" +>Next</A +></TD +></TR +></TABLE +><HR +ALIGN="LEFT" +WIDTH="100%"></DIV +><DIV +CLASS="SECT1" +><H1 +CLASS="SECT1" +><A +NAME="AEN2206" +>Selecting the backup medium</A +></H1 +><P +> The most important decision regarding backups is the choice + of backup medium. You need to consider cost, reliability, speed, + availability, and usability. </P +><P +> Cost is important, since you should preferably have + several times more backup storage than what you need for the data. + A cheap medium is usually a must. </P +><P +> Reliability is extremely important, since a broken + backup can make a grown man cry. A backup medium must be able + to hold data without corruption for years. The way you use the + medium affects it reliability as a backup medium. A hard disk + is typically very reliable, but as a backup medium it is not + very reliable, if it is in the same computer as the disk you + are backing up. </P +><P +> Speed is usually not very important, if backups can be done + without interaction. It doesn't matter if a backup takes two + hours, as long as it needs no supervision. On the other hand, + if the backup can't be done when the computer would otherwise + be idle, then speed is an issue. </P +><P +> Availability is obviously necessary, since you can't + use a backup medium if it doesn't exist. Less obvious is the + need for the medium to be available even in the future, and on + computers other than your own. Otherwise you may not be able + to restore your backups after a disaster. </P +><P +> Usability is a large factor in how often backups are made. + The easier it is to make backups, the better. A backup medium + mustn't be hard or boring to use. </P +><P +> The typical alternatives are floppies and tapes. + Floppies are very cheap, fairly reliable, not very fast, + very available, but not very usable for large amounts of data. + Tapes are cheap to somewhat expensive, fairly reliable, fairly + fast, quite available, and, depending on the size of the tape, + quite comfortable. </P +><P +> There are other alternatives. They are usually not very + good on availability, but if that is not a problem, they can + be better in other ways. For example, magneto-optical disks + can have good sides of both floppies (they're random access, + making restoration of a single file quick) and tapes (contain + a lot of data). </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="c2187.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="x2216.html" +>Next</A +></TD +></TR +><TR +><TD +WIDTH="33%" +ALIGN="left" +VALIGN="top" +>Backups</TD +><TD +WIDTH="34%" +ALIGN="center" +VALIGN="top" +><A +HREF="c2187.html" +>Up</A +></TD +><TD +WIDTH="33%" +ALIGN="right" +VALIGN="top" +>Selecting the backup tool</TD +></TR +></TABLE +></DIV +></BODY +></HTML +>
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