First
Published: May 3, 2003
Last
Revised: July 2, 2005
Standard Approach: Using
Reusable Media (Backup)
|
|
CDRW |
DVD+RW |
NS20 |
ADR30 |
DDS72 |
LTO2 |
|
Capacity (native) |
650M |
4.7G |
20G |
15G |
36G |
200G |
|
Daily Rotation Sets |
10 |
10 |
10 |
10 |
10 |
10 |
|
Weekly Rotation Sets |
10 |
10 |
10 |
10 |
10 |
10 |
|
No. of Media in set |
1 |
1 |
1 |
1 |
1 |
1 |
Failure rate
(3-yr cumulative) |
40% |
40% |
20% |
20% |
35% |
25% |
|
Total #Media Used |
28 |
28 |
24 |
24 |
27 |
25 |
|
Cost per Medium |
$ 1.00 |
$ 2.25 |
$ 40.00 |
$ 40.00 |
$ 24.00 |
$ 62.00 |
|
Cleaning Cartridge |
$ - |
$ - |
$ 35.00 |
$ 50.00 |
$ 60.00 |
$ 100.00 |
|
Total Media Cost |
$ 28.00 |
$ 63.00 |
$ 995.00 |
$ 1,010.00 |
$ 708.00 |
$ 1,650.00 |
|
Drive Cost: |
$ 50.00 |
$ 95.00 |
$ 200.00 |
$ 300.00 |
$ 800.00 |
$ 2,800.00
|
Based on 2-generation
rotation scheme: 10 week coverage span, 1-day restore point granularity
for last 12 work days, 1-week granularity for remainder of period. Total
Cost over 3-year period.
Alternate Approach: Using
Non-Reusable Media (Archiving)
|
|
CDR |
CDR |
CDR |
DVD+R |
DVD+R |
DVD+R |
|
Capacity (native) |
650M |
650M |
650M |
4.7G |
4.7G |
4.7G |
|
Frequency of Backup |
1x / Day |
2x / Day |
1x / Week |
1x / Day |
2x / Day |
1x / Week |
|
Weeks per Year |
50 |
50 |
50 |
50 |
50 |
50 |
|
Backups per Week |
5 |
10 |
1 |
5 |
10 |
1 |
|
No. of Disc(s) in set |
1 |
1 |
1 |
1 |
1 |
1 |
|
Years of Archiving |
3 |
3 |
3 |
3 |
3 |
3 |
|
Failure rate (per session) |
5% |
5% |
5% |
5% |
5% |
5% |
|
Total No. of Discs Used |
788 |
1,575 |
158 |
788 |
1,575 |
158 |
|
Cost per Disc |
$ 0.20 |
$ 0.20 |
$ 0.20 |
$ 0.65 |
$ 0.65 |
$ 0.65 |
|
Total Consumable Cost: |
$ 157.50 |
$ 315.00 |
$ 31.50 |
$ 511.88 |
$ 1,023.75 |
$ 102.38 |
|
Drive Cost: |
$ 50.00 |
$ 50.00 |
$ 50.00 |
$ 95.00 |
$ 95.00 |
$ 95.00 |
|