I have been using Cachy for 6 months. I have plenty of space but something I noticed is that every time I do an update (I update once per week) it sucks several gigs of disk space. The disk space is usually taken between /var/cache/pacman/pkg and btrfs snapshots. Some btrfs snapshot pairs of pre/post use a lot of “exclusive” space, those are the best to delete. You can delete everything in /var/cache/pacman/pkg or run paccache commands to only save x versions of older packages. But even if you do all this I see that sometimes nothing brings the space down much. And then out of nowhere you may see a big drop unexpectedly. It feels like something is wrong with cleanup. If I just ran updates every week and did nothing else, the used disk space would just keep growing and growing. I’m not counting anything in /home. /home fills up with tons of stuff like browser cache, application caches and data, etc. It’s kind of annoying how so much space is gone after running updates. Other than that, I love this OS. I just keep hacking the used space back down over and over.