[PROBLEM] BTRFS snapshots. Exclude paths

[xbfgf]

Running into a full filesystem often as I'm downloading files straight to my SD on a Raspberry.

Traced it to the regular snapshots running from cron.daily and cron.weekly, which keep a snapshot copy of the files even after they are deleted or moved. Deleting or moving the files doesn't free up space in that case.

Any ideas on how to exclude specific paths from the btrfs-auto-snapshot?
Is it a better idea to create a new btrfs subvolume, point all downloads there, and then change the cron entries to be specific (rather than the current //) and not include that new subvolume?