How to go about capacity planning for storage ?

Hi Experts,
How to go about Capacity Planning? For  instance if clients wants to upgrade to new server and new storage and asks us how much additional storage do you need for next 5 years, how can calculate the amount of storage.
I don't have any baseline info about the server of past years. Where can I start and any scripts you guys use for doing capacity planning?
Appreciate your help.
Thank you.
Sam

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