More like around 50 TiB total, saved in hosting fees.
6 architectures: aarch64, amd64, armv7, i386, powerpc, powerpc64
7 sets: /latest, /quarterly, /release_0, /release_1, /release_2, /release_3, /release_4
12 mirrors: nyi, bbt, bra, fmt, fra, jinx, kul, kwc, sjb, syd, tuk, twn