There aren't really all that many common unknown binary formats, in terms of GBs in people's drives. Mostly it's photos, pdfs, word documents, executables, vid

There aren't really all that many common unknown binary formats, in terms of GBs in people's drives. Mostly it's photos, pdfs, word documents, executables, videos, etc. Aside from that there are mathematical tools you can use to detect whether a binary blob is compressed/encrypted or not, like entropy calculation.