Economics of Public Cloud
Storage:
For primary storage and
disaster sites
November 2009
TwinStrata.com
2
Comparison
Compare total cost of ownership (TCO) of cloud storage versus local
storage
Capital and Operating expenses, ignoring local site floor/power/cooling costs
Calculate 3-yr TCO across the following storage use cases
Primary storage tier
Local storage array, local tape backup –versus-
CloudArray™ storage gateway, cloud storage, snapshot-based backup
Offsite replicated storage tier for disaster recovery
Local storage array with remote replicated disaster site –versus-
Local storage array with CloudArray™ cloud-hosted disaster site
Observe TCO as capacity increases
Start with 1TB baseline
Compare across fixed size X TB storage configurations
Compare across linearly growing 0-X TB storage configurations
TwinStrata.com
3
Baseline: 1TB storage capacity
$0.00
$50,000.00
$100,000.00
$150,000.00
$200,000.00
$250,000.00
Local
Storage
Cloud
Storage
In-house
Disaster
recovery
Cloud
Disaster
recovery
Capex
Opex
3yr TCO
Primary storage tier Offsite replicated storage tier
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4
3-yr TCO:
Fixed capacity, primary storage
$0.00
$20,000.00
$40,000.00
$60,000.00
$80,000.00
$100,000.00
$120,000.00
1
2
3
4
5
6
7
8
9 10
Local Storage
Cloud storage
Capacity in TB
TwinStrata.com
5
3-yr TCO:
Fixed capacity, offsite storage
$0.00
$50,000.00
$100,000.00
$150,000.00
$200,000.00
$250,000.00
$300,000.00
$350,000.00
$400,000.00
1 2 3 4 5 6 7 8 9 10 15 20 25
In-house Disaster
recovery
Cloud Disaster
recovery
Capacity in TB
TwinStrata.com
6
3-yr TCO:
Growing capacity, primary storage
$0.00
$20,000.00
$40,000.00
$60,000.00
$80,000.00
$100,000.00
$120,000.00
$140,000.00
$160,000.00
1
5
10
15
20
25
Local Storage
Cloud storage
Spikes in cost
are from
additional
storage array
Capacity inTB
TwinStrata.com
7
3-yr TCO:
Growing capacity, offsite storage
$0.00
$100,000.00
$200,000.00
$300,000.00
$400,000.00
$500,000.00
$600,000.00
$700,000.00
1 5 10152025303540455055606570
In-house D