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diff --git a/sag-0.6.1-www/Invisible/sag-0.6/node98.html b/sag-0.6.1-www/Invisible/sag-0.6/node98.html new file mode 100644 index 0000000..0fa02fb --- /dev/null +++ b/sag-0.6.1-www/Invisible/sag-0.6/node98.html @@ -0,0 +1,76 @@ +<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> +<!--Converted with LaTeX2HTML 96.1-h (September 30, 1996) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds --> +<HTML> +<HEAD> +<TITLE>Selecting the backup medium</TITLE> +<META NAME="description" CONTENT="Selecting the backup medium"> +<META NAME="keywords" CONTENT="sag"> +<META NAME="resource-type" CONTENT="document"> +<META NAME="distribution" CONTENT="global"> +<LINK REL=STYLESHEET HREF="sag.css"> +</HEAD> +<BODY LANG="EN" > + <A NAME="tex2html1553" HREF="node99.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="./next_motif.gif"></A> <A NAME="tex2html1551" HREF="node96.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="./up_motif.gif"></A> <A NAME="tex2html1545" HREF="node97.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="./previous_motif.gif"></A> <A NAME="tex2html1555" HREF="node1.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="./contents_motif.gif"></A> <A NAME="tex2html1556" HREF="node114.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="./index_motif.gif"></A> <BR> +<B> Next:</B> <A NAME="tex2html1554" HREF="node99.html">Selecting the backup tool</A> +<B>Up:</B> <A NAME="tex2html1552" HREF="node96.html">Backups</A> +<B> Previous:</B> <A NAME="tex2html1546" HREF="node97.html">On the importance of </A> +<BR> <P> +<H1><A NAME="SECTION001120000000000000000">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> + 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> + 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> + 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> + 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> + 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> + 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> + 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> +<HR><A NAME="tex2html1553" HREF="node99.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="./next_motif.gif"></A> <A NAME="tex2html1551" HREF="node96.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="./up_motif.gif"></A> <A NAME="tex2html1545" HREF="node97.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="./previous_motif.gif"></A> <A NAME="tex2html1555" HREF="node1.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="./contents_motif.gif"></A> <A NAME="tex2html1556" HREF="node114.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="./index_motif.gif"></A> <BR> +<B> Next:</B> <A NAME="tex2html1554" HREF="node99.html">Selecting the backup tool</A> +<B>Up:</B> <A NAME="tex2html1552" HREF="node96.html">Backups</A> +<B> Previous:</B> <A NAME="tex2html1546" HREF="node97.html">On the importance of </A> +<P><ADDRESS> +<I>Lars Wirzenius <BR> +Sat Nov 15 02:32:11 EET 1997</I> +</ADDRESS> +</BODY> +</HTML> |