All partitions (both local storage and networked storage) are deleted as soon as the keep at most time limit of their retention policy is reached.

Partitions that are successfully moved to networked storage. The oldest is moved first until none are left or until the desired amount of space is available.

Partitions that are not yet moved to networked storage, but have reached their retention policy's keep at most time limit. The partitions that are close to the keep at most limit are deleted first, until none are left or until the desired amount of space is available.

If at least half of the desired space is not yet free, partitions are deleted early, on the assumption that incoming data is more important than old data.

Partitions that are not yet moved to networked storage that have reached their policy's keep at most time limit. The partitions that are close to the keep at most limit are moved first, until none are left or at least half of the desired amount of space is available, but the current UTC day partitions are not deleted.