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diff --git a/sag-0.6.1-www/Invisible/sag-0.6/node97.html b/sag-0.6.1-www/Invisible/sag-0.6/node97.html new file mode 100644 index 0000000..2f1ca72 --- /dev/null +++ b/sag-0.6.1-www/Invisible/sag-0.6/node97.html @@ -0,0 +1,71 @@ +<!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>On the importance of being backed up</TITLE> +<META NAME="description" CONTENT="On the importance of being backed up"> +<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="tex2html1541" HREF="node98.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="./next_motif.gif"></A> <A NAME="tex2html1539" HREF="node96.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="./up_motif.gif"></A> <A NAME="tex2html1533" HREF="node96.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="./previous_motif.gif"></A> <A NAME="tex2html1543" HREF="node1.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="./contents_motif.gif"></A> <A NAME="tex2html1544" HREF="node114.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="./index_motif.gif"></A> <BR> +<B> Next:</B> <A NAME="tex2html1542" HREF="node98.html">Selecting the backup medium</A> +<B>Up:</B> <A NAME="tex2html1540" HREF="node96.html">Backups</A> +<B> Previous:</B> <A NAME="tex2html1534" HREF="node96.html">Backups</A> +<BR> <P> +<H1><A NAME="SECTION001110000000000000000">On the importance of being backed up</A></H1> +<P> + Your data is valuable. It will cost you time and effort re-create + it, and that costs money or at least personal grief and tears; + sometimes it can't even be re-created, e.g., if it is the + results of some experiments. Since it is an investment, you + should protect it and take steps to avoid losing it. +<P> + There are basically four reasons why you might lose data: hardware + failures, software bugs, human action, or natural + disasters.<A NAME="tex2html46" HREF="footnode.html#2915"><IMG ALIGN=BOTTOM ALT="gif" SRC="./foot_motif.gif"></A> + Although modern hardware tends to be quite reliable, it can + still break seemingly spontaneously. The most critical piece + of hardware for storing data is the hard disk, which relies on + tiny magnetic fields remaining intact in a world filled with + electromagnetic noise. Modern software doesn't even tend to + be reliable; a rock solid program is an exception, not a rule. + Humans are quite unreliable, they will either make a mistake, + or they will be malicious and destroy data on purpose. Nature + might not be evil, but it can wreak havoc even when being good. + All in all, it is a small miracle that anything works at all. +<P> + Backups are a way to protect the investment in data. By having + several copies of the data, it does not matter as much if one + is destroyed (the cost is only that of the restoration of the + lost data from the backup). +<P> + It is important to do backups properly. Like everything + else that is related to the physical world, backups will fail + sooner or later. Part of doing backups well is to make sure + they work; you don't want to notice that your backups didn't + work.<A NAME="tex2html47" HREF="footnode.html#2916"><IMG ALIGN=BOTTOM ALT="gif" SRC="./foot_motif.gif"></A> + Adding insult to injury, you might have a bad crash just as + you're making the backup; if you have only one backup medium, + it might destroyed as well, leaving you with the smoking ashes + of hard work.<A NAME="tex2html48" HREF="footnode.html#2917"><IMG ALIGN=BOTTOM ALT="gif" SRC="./foot_motif.gif"></A> Or you + might notice, when trying to restore, that you forgot to back + up something important, like the user database on a 15 000 user + site. Best of all, all your backups might be working perfectly, + but the last known tape drive reading the kind of tapes you + used was the one that now has a bucketful of water in it. +<P> + When it comes to backups, paranoia is in the job description. +<P> +<HR><A NAME="tex2html1541" HREF="node98.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="./next_motif.gif"></A> <A NAME="tex2html1539" HREF="node96.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="./up_motif.gif"></A> <A NAME="tex2html1533" HREF="node96.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="./previous_motif.gif"></A> <A NAME="tex2html1543" HREF="node1.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="./contents_motif.gif"></A> <A NAME="tex2html1544" HREF="node114.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="./index_motif.gif"></A> <BR> +<B> Next:</B> <A NAME="tex2html1542" HREF="node98.html">Selecting the backup medium</A> +<B>Up:</B> <A NAME="tex2html1540" HREF="node96.html">Backups</A> +<B> Previous:</B> <A NAME="tex2html1534" HREF="node96.html">Backups</A> +<P><ADDRESS> +<I>Lars Wirzenius <BR> +Sat Nov 15 02:32:11 EET 1997</I> +</ADDRESS> +</BODY> +</HTML> |