After migrating to Discourse, I was concerned that our backups seemed to be increasing far more than expected. I was seeing backups increase by up to 30MB/week (after accounting for uploads) for only ~150 posts/week. But after about three months since migrating, the backups have stabilised to just 1-3MB/week. My guess would be that it took some logs some time to reach an equilibrium for new data vs expiring data. So if anyone else is in a similar situation after migrating, from my experience I’d say not to worry, it will eventually stabilise.