I have one for France, one for Hungary, one for Czech, two for Russia | Eastern bloc, two for USA, & one for Europe other, which would be dominated by Romania, then Italy & Spain.
Then within them I had it neatly organised thanks largely to Eurobabeindex.com, about 5 years ago my organisational skills were decent. E.G. my Hungary drive would have subsections like 1995 - 1999 | 2000 - 2002 | 2003 - 2008 | 2009 - present day, with individual folders for the ladies.
But the last couple of years, I've just joined sites for a year or two & downloaded by site, & organised by site. Lets face it, there are only 4-6 crucial sites... this site of course being Alpha.

Mind you, thats just theory. I get the membership & then forget to do anything mostly.

Downside was | is no backups. I 'lost' my Czech drive, painstakingly put together, for two years. Thankfully a RAID controller replacement fixed the issue.