In another thread it was pointed out that storage is not really free. I wrote:
Of course it’s not free. That’s a phrase we use (“we” in the tech industry) not just to indicate that something has become cheaper under Moore’s law, but that it has become so cheap that other considerations predominate. Let me illustrate.
I showed that storing an album on hard disk costs a few cents, while storing the jewel case costs a few dollars (the book case, floor space). And then you have the cost of ripping it, plus editing the metadata. This may take ten minutes if you’re good, half an hour or more if things are not so efficient. How do you value your time? There is all this talk in the U.S. about how minimum wage should be $15/hour; at the other end the threshold for being in the top 1% in the U.S. is $400,000 per year, if you work 2,000 hours per year to earn that, it’s $200/hour. Ten minutes at minimum wage is $1, half an hour for a one-percenter is $100, $10 might be a reasonable estimate.
So if disk space costs cents, jewel case storage costs dollars, and labor costs tens of dollars – yeah, the disk space is “free” within the boundaries of that process. It is roundoff.
Yes, disk space must be managed and protected against failure. Replicating to another disk is a good idea, maybe in a NAS – but you need to do that in any case since you do have some data, on the margin the extra cost is just the additional cents for that disk space. Replicating to the cloud is also a good idea, on the margin this will cost anywhere from zero to cents. There is some labor involved in managing these backups, but you have to do that anyway, on the margin the extra album doesn’t add anything. Minimal cost “on the margin” is the essence of scalable technologies: there is a cost and effort to set things up and learn to manage it, but once that is done the cost is not proportional to the number of bytes.
So that’s the reasoning: “storage is free” means on the margin, the incremental cost of storing one album is insignificant, orders of magnitude smaller than other costs. The statement is not just hyperbole, it is a meaningful statement of a sound financial analysis.