Fanbox has a pretty interesting model for this, when you subscribe to a creator you only get access to posts up to a month prior (as well as all future posts),

Fanbox has a pretty interesting model for this, when you subscribe to a creator you only get access to posts up to a month prior (as well as all future posts), and to get access to specific previous posts the creator can make available bundles which you can buy for a one time fee. It reduces piracy and encourages prolonged subscriptions rather than subscribe->download all->unsubscribe.