Most of the images here are drawn, but there are lots of photos as well and a lot of them feature nudity. I don't see how the new rules won't apply to them and they will have to be removed.

Also, does the backup option apply to us?

To put it simply, yes, this does affect our booru since we have posted photos of real people on here before. I'd say as a precaution not to post photomanips of real people, actors, actresses, etc. just in case those count as "real" porn. I know that kind of stuff is photoshopped, just saying it to be safe. Or, Ashi (our admin) might say otherwise about it.
From what I understand, illustrated images should be still fine to post. We'll obviously have to be a lot more strict with posts that depict characters that aren't at least 18 years old in sexual acts and such.
It seems like the backup thing applies to booru admins, so you'd have to ask Ashi or another admin about it.

What if it's a real pic of our own feet?