Clarification on node storage requirements

In various pages, this formula is presented to compute node size:

```
(2 × chain_size) + snapshot_size + 20% buffer
```

According to the links in this [page](https://github.com/base/docs/blob/4c08ce41155d248ff1ac740fad9d70cc92700b55/docs/base-chain/node-operators/performance-tuning.mdx#L18), the values of the variables for a Reth Archive setup are:

* snapshot_size = 1.83 TB ([link](https://basechaindata.vercel.app/))
* chain_size = 8.88 TiB, or 9.76 TB ([link](https://www.base.org/stats), assuming that it's the value of "Reth Mainnet Archive" that should be used)

Which gives a total NVMe storage requirement of `(2*9.76+1.83)*1.2` TB, which is **25.62 TB**

I have the following questions:

- Is this computation correct?
- Is the presence of the snapshot size in the formula only necessary to account for its initial download+de-compression? Meaning it could be skipped if we download and uncompress without persisting the archive