[Gllug] Advice on backup options

[Doug Winter]

On Wed 07 Jul Rev Simon Rumble wrote:
> Backup is designed for two different types of data disaster.  The most
> common is a hard disk crash, where the finite-lifespan of the moving
> disk platter comes to an end, which is unpredictable.  The other is
> the business-continuity problems of major disasters fire, flood,
> nuclear holocaust etc.

There are other reasons for backup than these two.  The most important
are user error (i'm sure i'm not the only person to do rm -rf * in the
wrong place :) and security (if you discover you have been compromised,
and you know when, you may be able to restore to a backup from before
then).

Both of these reasons mean that a mirror is not enough, you need some
form of incremental offline storage (even if it's archives on another
disk rather than tape).

doug.

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