@Zerglingman i prefer flac for achival purposes, listening i can't really distinguish it from even opus down to 96kbps (depending on genre).
i bet the bandcamp flacs are also really badly compressed to save on computing power. ~570M is almost a CD.
@Zerglingman
i just tested with a FLAC file from bandcamp putting it through "flac -8 -o outfile.flac infile.flac" and it saved about a megabyte, but i think that depends on the kind of music. white noise is badly compressible.
FLAC is lossless but like for other lossless compression formats you can choose how much the algorithm should try to reduce it. it should never (except if something is badly broken) lose information.
i just want the ability to convert things to other formats without additional losses, so i try to keep my archive as FLAC, disc space is cheap enough now.
@Zerglingman i think 2x ogg isn't really realistic for most kinds of music.