How much storage does each artifact version use?

Only files that change between two artifact versions incur storage costs.

Consider an image artifact named animals that contains two image files, cat.png and dog.png:

images
|-- cat.png (2MB) # Added in `v0`
|-- dog.png (1MB) # Added in `v0`

This artifact receives version v0.

When you add a new image, rat.png, W&B creates a new artifact version, v1, with the following contents:

images
|-- cat.png (2MB) # Added in `v0`
|-- dog.png (1MB) # Added in `v0`
|-- rat.png (3MB) # Added in `v1`

Version v1 tracks a total of 6 MB, but occupies only 3 MB of space because it shares the remaining 3 MB with v0. If you delete v1, you reclaim the 3 MB of storage associated with rat.png. If you delete v0, the storage costs of cat.png and dog.png transfer to v1, which increases its storage size to 6 MB.

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Artifacts Storage