I've read in a few threads that 7z is not good for backups, but I can't really remember what the reasoning was. Maybe corruption, although I would think that any file is prone to that which is why I would be backing up anything important on multiple drives instead of just one, but I'm also very new to this field since my hard drives are now reaching their 11 year marks, I think it's long past the time I should be backing things up.
The most important things to me are project files from music production, like Ableton project files, which can be anywhere from 4MB to 2GB each (and there are almost 2000 of them so this whole folder is about 90 GB), along with more folders with just thousands of audio files (about 6000)
I don't often rely on clouds for backups but instead I just get new hard drives and make copies of data on them. But as for moving around these large folders between computers, it would be huge transfers, and 7z can infact compress audio files by a bit. Would it be worth it for these backups or should I just back them up raw? Or is another format better (like tar along with a compression method like xz)