When you want to preserve your digital data: how few copies
Dr. Rosenthal's classic "How Few Copies" examines in detail just how few of copies you might need to preserve your digital data. (The context is Lots Of Copies Keep Stuff Safe, which you need to know about if you care about digital preservation.)
If preservation (and backup is part of preservation) is one of your interests, Dr. Rosenthal's blog is just a generally good blog to read.
Perl/CPAN user since 1992.
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