dpcc

Digital Preservation Cost Calculator

Quick Start

The latest build from master should always be at https://umd-coding-workshop.github.io/dpcc

Building and Testing

Requires NodeJS. Use Grunt and Browserify to build and test the Web UI:

# install the build tools
npm -g install grunt-cli browserify

# build and run for testing
npm install
grunt
./server.js

Command-Line Program

There is also a dpcc-cli.js script that runs on the command line using NodeJS. It takes two arguments: the amount of data to store, and how long to store it for, and produces a chart of the costs for the various services defined in the services.json file.

# install dependencies
npm install

# estimate costs for 50 TB stored for 5 years
./dpcc-cli.js 50 5

Initial Brainstorm

Dimensions
[$] money
[B] storage
[T] time

Units
dollars, terabytes, years

User supplied inputs
- service (sets the rates and variables)
- amount [B] (e.g., "50 TB")
- time [T] (e.g., "5 years")

Rates
ingest cost    [$]/[B]
membership fee [$]/[T]
storage rate   [$]/[B][T]

Variables
included storage   [B]
storage increment  [B] (e.g., APTrust sells storage in 5TB increments)

Formulas
storage cost = storage rate * ceiling(non_negative(amount - included storage)/storage increment) * storage increment

function non_negative(x) {
  return x >= 0 ? x : 0;
}