Every once in a while I use Google Takeout (now called just "Download your Data" or something), to get a copy of all my stuff that Google holds.
Since the last time I did this (about six months ago), the
.tbz (bzip2) compression method no longer seems to be available (just
.tgz). Also, my email came down in an uncompressed mbox file, which surprised me. That plain text email is massively compressible.
Here is a screenshot from the download page:
Has there been any announcement about the compression methods available for Google Download your Data? I couldn't find anything with a reasonable search.