UPGRADING REPAIRING PCs

160
Table 5.13 High-Performance Tape Backup Standards Compared
Continued
Chapter 5—Floppy, Removable, Tape, and Flash Storage
Capacity/2:1
Backup Speed
(Native/ Drive Price Media
Drive Type Compressed Compressed) Range Cost
ADR 50GB 25GB/50GB 2–4MB/sec
SCSI;4–8MB/sec
LVD SCSI
$699–$949 $60
AIT-2 50GB/100GB 6–12MB/sec $3000–$3200 $110–$120
DLT 2000 15GB/30GB 1.2–2.5MB/sec $1200–$1300 $30–$50
DLT 4000 20GB/40GB 1.5–3MB/sec $1300–$1850 $60–$75
DLT 7000 35GB/70GB 5–10MB/sec $4300–$4700 $70–$90
Successful Tape Backup and Restore Procedures
A backup tape might be the only thing separating you from a complete
loss of data. To ensure that every backup can be restored, follow
the guidelines shown in Tables 5.14 and 5.15 when you create
a backup or restore one.
Table 5.14 Tape Backup Tips
Tip Benefit Notes
Perform the Tests DMA channels in Keep a spare blank tape at all times
confidence test computer for safe data to enable you to perform this test
during tape transfer; sets default whenever new hardware is installed
backup software transfer rate for backup. or before running a new backup for
installation. safety.
Select the “Full” backup backs up Make a disaster recovery backup
correct backup contents of system, but and test your ability to restore your
type. operating system must backup to an empty hard drive.
be restored first before Use other backup types for
restoring backup. “Disaster
Recovery” backup creates
special boot disks and
enables entire system
recovery straight from
tape to an empty hard
drive. Other backup types
are designed primarily for
data backup.
periodic backups.
Choose speed Maximum data
and safety. compression uses the
least amount of tape and
is often about as fast as
other backup types. Use
Compare after to ensure
readability.