Okay, just came here from your "disable download limits" thread. I strongly assume nobody of the responsible people has seen this yet, or I guess they would have contacted you.
I'm not on the staff, so I suggest you contact them through some other means (i.e. IRC).
Generally speaking I think you're not that familiar in how you usually mirror a site, right?
Your efforts in all honors, but I think you're a) breaking your neck the way you approach this and b) run in danger of being shot down for not doing it with permission.
Of course the latter point is kind of moot for a site that hosts scanlations, but I guess you're trying to be helpful, not mean. :)
First off, mirroring isn't typically meant to be done by a user via saving stuff themselves and then uploading it somewhere else. That might actually be illegal (see above, though, and I'm no expert there). It would be a lot easier if the site's creator just uploads it a second time to a different host. Both sites are then usually synched using one or more means of automation.
That is actually how the wayback machine works. It crawls the net (using the same bots that for example google uses, too) and saves the html it sees. Every site can easily (via convention) forbid this. Also, WBM, as I see it, intentionally leaves out certain files (the downloads are probably intentionally not saved).
I am also wondering how you intend to approach the upload to WBM. As far as I see it, there's no means to just say "here, I have some site data from there and there, take it". And there's a reason for this, that way anybody could alter the backup and fake things that never were. The Archive crawls for the sites on its own, all you can do is basically ask it to store a site, but it will not demand you download anything. Again, there's definitely a legal reason for this (and a practical one, too).
TL;DR: Try to get a hold of a higher staff member. Casusby, MrEngenious, or omniscient0 (check the suggestions for improvements thread)