Understanding Heroku's database storage

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I have a Heroku PG Yellow DB, which has a storage capacity of 64 GB. However my instance's data size is currently over 200 GB. Is there a difference between data size and storage capacity? If not, shouldn't it stop storing data in the DB post 64 GB?

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Tadashi Mori On

200GB is including the reserved space for indexation and other performance related tasks and for future data. If you click on "Capture Backup" You'll see the actual storage size you're using.