Your node doesn’t contains files, it contains pieces. One piece from 80 pieces of the customer’s file.
The node cannot be trusted regarding data consistence, it should be audited by the authored entity, the audit service in this case.
To audit your node the satellite should download all pieces from your node for the same cost as repair, but repair nothing, only check, then download 29 pieces to reconstruct the file, then split it to 80 and upload them to nodes. The upload from any cloud provider is cost money (see Is there such a thing as an "un-disqualify"? - #32 by Alexey for numbers).
This would be significantly more expensive than just repair when the number of pieces would fall below the threshold (35 pieces by default), when the worker would need to download only once, not twice in case of full audit.
So, if you would like to pay for it, you will pay for audit 20TB * $10 = $200, then for repair (29/80 from the lost space), if you have lost 1TB, it would be 29/80 * 1 * 80 * $10 = $290 plus upload costs from the cloud provider.
In case of regular worker it will be triggered only when the number of pieces would fall below the threshold (which can be not happen if customer deletes their files for example).
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