# Accuracy Over Time data storage
URL: https://docs.datarobot.com/en/docs/release/deprecations-and-migrations/aot-storage.html

> Changes to Accuracy over Time data storage.

# Accuracy Over Time data for Python 3 projects

DataRobot has changed the storage type for [Accuracy over Time](https://docs.datarobot.com/en/docs/classic-ui/modeling/analyze-models/evaluate/aot-classic.html) data from MongoDB to S3.

## Managed AI Platform user impacts

On the managed AI Platform (cloud), DataRobot uses blob storage by default. The feature flag `BLOB_STORAGE_FOR_ACCURACY_OVER_TIME` has been removed from the feature access settings.

## Self-managed AI Platform user impacts

### Versions 9.2 and newer

For self-managed AI Platform users on these versions, the feature flag `BLOB_STORAGE_FOR_ACCURACY_OVER_TIME` has been removed from the feature access settings. Starting with version 9.2, DataRobot stores two versions of data (blob storage and Mongo). In version 10.0 DataRobot uses blob storage by default. In version 10.2 DataRobot deletes data that is not used anymore.

### Versions 9.1 and older

For self-managed users on these versions, projects built with Python 2 will not be changed. All other projects will be reset with the ability for you to recalculate Accuracy over Time data. After that, new Accuracy over Time data that is calculated will be stored and read from blob storage. The feature flag `BLOB_STORAGE_FOR_ACCURACY_OVER_TIME` has been removed from the feature access settings.

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