atari email archive

a collection of messages sent at Atari from 1983 to 1992.

Private data backups

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	Due to a severe increase in demand, we are forced to state some
kind of policy on private archival backup tapes.  Effective immediately,
anyone can have a backup done on a BYOT (bring your own tape) basis.

	If you provide a tape to Sharron, along with a specification of
files to be backed up, she will process the backup and return the tape.
Deletion of the files is UP TO YOU.  The safekeeping of the tape is also
your own responsibility.  We will continue the current backup schedule
as normal (every noon, to be kept til noon the next day; every morning, to
be kept a week, except for fridays, which are kept a month, except for
the LAST friday of each month, to be kept a year).  These tapes we will
retain; but we don't have the storage nor the media for everyone to have
a tape or two of their own.

	If you choose this approach, redundancy is YOUR HEADACHE.  If something
happens to your own tape, and it is not on any of the tapes we still have,
your data will be lost.  Note that there is the possibility of damage to the
tape, as well as accidental erasure, when adding to an existing set.  It
is reccommended that you keep separate tapes for separate projects, instead
of trying to "cheap out" and fit twenty sets on one tape.  If sets one
thru 19 get blown away when you add number 20, you would be very upset.

	The moral of the story is that if the data is important enough to keep,
you should keep it as a set, intact, and seperate.  We will not mount the
media write-enabled for a restore; but in order to add to the set, you run
the risk of accidental overwrite.

	All of the above applies to floppies, as well as tape; floppies are
a little more convenient to store, but don't hold as much.  Rough figures

	Tape (2400 ft, 8KB block size) = 40MB storage, or 80,000 disk blocks
(figure 75K blocks after backup adds its own overhead)

	Floppies (single density, our default) = .25MB, or 500 disk blocks.

	Floppies (double density, YOU MUST SPECIFY) = .5MB, or 1,000 disk
blocks.  If you want double density, all of the floppies to be written on
must be pre-initialized before the backup starts.  Therefore, you need to
KNOW beforehand just how many floppies are to be used.

	Floppies can be file structured, meaning they can have directories
on them, and are much easier to update (as opposed to backup sets, which have
to be created all at the same time).  Multi-volume sets only apply to the
backup program; if it won't fit on one floppy, you need a backup set on more
that one floppy, or one or more tapes.  Do a $DIR/SIZ to find out how much
data you have.  This should probably make the answer obvious.

	If I can help you determine your needs, give me a call.

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Jul 19, 1983