[@robin-w Moderator 2 years, 9 months ago]

bbpress stores entries as WordPress posts within the database.

My test site has over 8,000 posts and the whole database takes up 155MB.

It is not something you probably need to worry about – most hosters offer storage in the multiple GB realms.

Plugins, media and themes take file space (rather than database).

If you want to keep an eye on it go to

dashboard>tools>site Health>info>directories and size and you can see what is being used