Please do support archive.org (Internet Archive) but archive.is is a different entity (which apparently one can donate to, though not sure of its structure), see https://en.wikipedia.org/wiki/Archive.today

Although I do agree with the mission of archiving content, I find it quite interesting to be willing to pay for an organisation to archive content as a way to get content for free rather than pay for the content itself.

It's a bit of a conundrum because we need both, so ideally everyone would pay for both. It costs money to archive content, it also costs money to produce it.

Now this is under the assumption you're praising archiving services as a workaround paywalls, but I may have misinterpreted your comment: in which case feel free to correct me!

Should be publicly funded tbh