Edit: To clarify:
Is it even possible, financially speaking, to keep adding storage? I mean, advertisements don’t even make a lot of money, is the indefinite growth of server storage even sustainable?
Or will they do what Twitch does with old content and just delete them?
Storage is cheap, especially at the corporate scale.
Make two simplifying assumptions: pretend that Google is paying consumer prices for storage, and pretend that Google doesn’t need to worry about data redundancy. In truth Google will pay a lot less than consumer prices, but they’ll also need more than 1 byte of storage for each byte of data they have, so for the sake of envelope math we can just pretend they cancel out.
Western Digital sells a 22TB HDD for $400. Seagate has a 20TB HDD for $310. I don’t like Seagate but I do like round numbers, so for simplicity we’ll call it $300 for 20TB. This works out to $15/TB. According to wikipedia, Youtube had just under $29b of revenue in 2021. If youtube spend just $100m of that — 0.34% — they’d be able to buy 6,666,666 of those hard drives. In a single year. That’s 6,666,666x20TB = 133,333,333 TB of storage, also known as 133note 1 exabytes.
That’s a lot of storage. A quick search tells me that youtube’s compression for 4k/25fps is 45Mbps, which is about 5.5 megabytes/s. That’s 768,722 years of 4k video content. All paid for with 0.34% of youtube’s annual revenue.
Note 1: Note that I am using SI units here. If you want to use 1024n for data names, then the SI prefixes aren’t correct. It’d be 115 exbibytes instead.
EDIT: I initially did the price wrong, fixed now.