Tape Backup Systems
are Amazing Tools
For Protecting Data. Administer Them
Properly for a Good Defense.
This document is also available in Acrobat
format as backup_tape_mgmt.pdf.
This is a Policy Document. The ideas expressed
here are solely the opinions of SoftProse Technology, Inc.
PLEASE NOTE: A blinking Yellow Light on the face of the tape
device indicates an error. Errors must be cleared with the Cleaning
Tape, per the description below.
The following is suggested as policies for Daily
tape backups:
- There should be at least 12 tapes available, and a Cleaning
Tape.
- The twelve tapes include four tapes marked with Monday, Tuesday,
Wednesday,and Thursday on both the tape cartridge itself and
the protective box. Mark these tapes, and tape box, with the
date they are first used.
- There should be up to eight Weekly Tapes, marked Week1, Week2,
Week 3, etc, dated with the first date used.
- A standard 3.5" floppy disk box, without dividers, could
be a good place to keep standard 4mm DAT tapes.
1) Backup tapes must be changed EVERY DAY, with
the "Tape of the Day."
(Friday's backup is with the numbered "Tape
of the Week", described below.)
2) When a backup is completed, the software
should EJECT it from the drive automatically.
There should be an ejected tape EVERY WEEKDAY
MORNING. If not, something is very wrong!
3) There is a tape for every day of the week
but for FRIDAY- Friday is a numbered WEEKLY TAPE.
BEFORE inserting Friday's weekly tape, place
the Cleaning Tape in the machine for a cycle.
The Cleaning Tape will eject automatically
when cleaning is complete. (About 1 1/2 min.)
MARK the record in the Cleaning Tape box with
an "X" to indicate that it was used.
4) The WEEKLY TAPE is known by a number,
which increments each week. (1-8 weeks is standard.)
Keep a "Tape Calendar" near the server, and mark the
number for each Weekly Tape every Friday.
USE THE RIGHT TAPE FOR THE WEEK- Check the
calendar, and use them in order.
5) On Monday Morning, the log file should
be checked to confirm that the Friday (Weekly) backup was without
errors. Send the new Weekly tape home with a responsible person,
as an Off-Site Backup.
On TUESDAY, the previous Weekly Tape (that
had been sent home) should be returned to the tape box.
6) ERRORS can occur on the tape drive, ruining
a backup. This is indicated by a Blinking Yellow Light on the
tape drive itself. These error must be cleared before successful
backups will resume!
(Errors should be marked as a Failed Backup
on the Tape Calendar.)
TO CLEAR ERRORS:
- IDENTIFY the fault by observing a blinking yellow light on
the face of the tape device.
- RECORD the FAILED backup by placing a slashing line across
the Tape Calendar's date.
(You may also want to append a short note "Data
Error" to this date.)
- CLEAN the tape device and clear the fault by inserting the
Cleaning Tape, and letting it complete its cycle. THIS SHOULD
BE DONE THREE TIMES after an Error.
(About 1 1/2 minutes each time.) The tape will eject automatically
after each cycle.
- CHECK the inside of the Cleaning Tape case with "X"
marks. Each time the tape is used (inserted and cycled) a box
MUST be checked in the tape case. IE: Three cycles = 3 marks.
Tape Library Policies:
All new tapes should be DATED with the date that they are
first placed into service. No tape should be in service for more
than a full year. (Old tapes are the most common source of tape
errors.)
Daily Tapes should be replaced every 6 months- We suggest
that you send old tapes home with a "responsible person"
as an archive. This will also serve as an off-site 6 month backup.
Weekly Tapes should be replaced every full Year.
(Again, send them home with the batch of six-month daily tapes.)
Save Money on Tape Media
Don't buy larger tapes than you need for Daily Backups.
A DDS Dat drive can use any DDS tape from a rating equal to
or less than it's DDS number. Therefore, a DDS-4 tape drive (20/40
Gigabytes, with and without compression) can use DDS-3 (12/20),
DDS-2 (4/8) and DDS (2/4) tapes. However, these tapes will only
work to their rated capacity. Lower capacity tapes are less expensive.
Plan your backup strategy, and buy the appropriate media for
your needs. |
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