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A. New head node

Dedicated chassis, 1 U

One of four (a Quad), in one chassis.
(2U)

Consider Option 2 for cost savings (if any).
To do: Calculate cost savings (if any).
Any other considerations, such as risk or recovery challenges?

B. New storage machine

Synology box

Home-brewed storage box, perhaps running OpenNAS software

Cosdier Option 2 for cost savings (if any).
BUT, must also consider risk, support, and staffing effort.

C. New computational nodes

8 nodes, with higher computational processor

16 nodes, with standard computational processor

D. Arrange an efficient back-up plan

EZ-Backup
 

(At current quantities of backed-up data, ChemIT cannot recommend an alternative.)

Evaluate cost-effectiveness as volume grows. At current TB's of backup, costs are as were predicted (no surprises), and thus were at the time considered to be affordable and cost-effective compared to investing in own hardware and staffing.