[nikisweeting]

WACZ is a replacement for WARC that has the index with offsets built in.

[infogulch]

But it uses warc files inside as the archive format. It seems weird to call it a replacement when the original is still present.

[nikisweeting]

I just meant from a user's perspective it's a format that superseeds WARC. But internally, yes, one is an encapsulation format for the other.