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Chapter 12:
Network Disaster Recovery
Choosing Backup Strategies
After acquiring all the necessary information, you can plan a backup rotation strategy,
which addresses how backup media is rotated. Backup rotations are designed to
accomplish the following goals:
Rebuild the system with the most recent data possible, in case of a catastrophic
failure
Restore files from older tapes that may have been accidentally erased or
damaged without anyone noticing the potential loss of data immediately
Table 12-1.
Types of Backup Technologies
Type
Approximate
Cost of Drive
Approximate
Cost of Media
Media Capacity
Pros and Cons
CD-R/RW
drives
$100
($153/GB)
<$1
(<$1.53/GB)
650MB
+ Random access
-Small capacity
-Slow speed
-CD-R media is not
reusable
DVD-ROM/
RW drives
$200
($40/GB)
$1
($0.2/GB)
5GB
+ Random access
+ Large capacity
-Slow speed
Digital linear
tape (DLT V4)
$1,000
($3/GB)
$60
($0.19/GB)
320GB
+ Very reliable
+ Very fast
+ High per-tape
capacities
+ Extremely low media
cost/MB
Super DLT
(SDLT 600)
$3,000
($5/GB)
$50
($0.08/GB)
600GB
+ Very reliable
+ Very fast
+ High per-tape
capacities
+ Extremely low media
cost/MB
Linear Tape-
Open (LTO-2
to LTO-4)
$27,000
($610/GB)
$3040
($0.050.15/GB)
200800GB
+ Very reliable
+ Very fast
+ High per-tape
capacities
+ Extremely low media
cost/MB
Summary :
Types of Backup Technologies Type Approximate Cost of Drive Approximate Cost of Media Media Capacity Pros and Cons CD-R/RW drives $100 ($153/GB) <$1 (<$1.53/GB) 650MB + Random access -Small capacity -Slow speed -CD-R media is not reusable DVD-ROM/ RW drives $200 ($40/GB) $1 ($0.2/GB) 5GB + Random access + Large capacity -Slow speed Digital linear tape (DLT V4) $1,000 ($3/GB) $60 ($0.19/GB) 320GB + Very reliable + Very fast + High per-tape capacities + Extremely low media cost/MB Super DLT (SDLT 600) $3,000 ($5/GB) $50 ($0.08/GB) 600GB + Very reliable + Very fast + High per-tape capacities + Extremely low media cost/MB Linear Tape- Open (LTO-2 to LTO-4) $27,000 ($610/GB) $3040 ($0.050.15/GB) 200800GB + Very reliable + Very fast + High per-tape capacities + Extremely low media cost/MB
Tags :
media,ery,backup,low,extremely,high,capacities,costmb,pertape,fast,reliable,capacity,slow