Unfortunately, when I talked to a few archival teams (including the IA) about whether they'd be interested in using it, I either got no response or a negative one.
If you have a raid, then you have 2 copies with like 99.99% availability and 5 mean time years to failure.
With a volunteer drive you have like ?% availability and ?% years to failure? You can't depend on it.
Also the average value of data is very low, you don't want to be making many copies of for no reason.
> Also the average value of data is very low, you don't want to be making many copies of for no reason.
The reason is that the value of that data is high to the archivist, since they want to preserve it.
Realistically you won't get enough volunteer-storage to cover one IA. And even if you did, it wouldn't satisfy the mission requirements, which is to store reliably for decades all of the data.