Keep in mind that although the Wayback Machine (Archive.org / Internet Archive) will accept archival requests through a simple URL submission[1], Archive.Today does not and AFAIU requires at least some manual interaction to complete an archive request. Archive.Today also rate-limits submissions and will through up CAPTCHA tests if you're exceeding rates (though so long as you're retaining cookies, though seem to stay good for a while).

I've archived 100s to low 1,000s of my own personal contributions on a few online services to both sites.

For Archive Today, it is possible to expedite the archival process by generating the initial submission URL, though you'll have to complete another two steps after that point manually as I recall. If you're archiving a large set of sites, you can compile a list, generate a Web page off of that, and work through it at a pretty good clip.

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Notes:

1. The URL format being

  https://web.archive.org/save/<URL-to-save>

You can submit that via a script using any HTTP request generator, e.g., curl, wget, w3m, lynx, etc.