When GCS object versioning is enabled, every overwrite or delete operation creates a new noncurrent version. Without a lifecycle rule to manage old versions, they persist indefinitely. Over time, this results in: * Accumulation of outdated data * Unnecessary storage costs, especially in Standard or Nearline classes * Lack of visibility into what is still needed vs. legacy debris This issue often goes unnoticed in environments with frequent data updates or automated processes (e.g., logs, models, config snapshots).

Buckets without Autoclass enabled can accumulate infrequently accessed data in more expensive storage classes, inflating monthly costs. Enabling Autoclass allows GCS to automatically move objects to lower-cost tiers based on observed access behavior, optimizing storage costs without manual lifecycle policy management. Activating Autoclass reduces operational overhead while maintaining seamless access to objects across storage classes.

GCS buckets often persist after applications are retired or data is no longer in active use. Without access activity, these buckets generate storage charges without providing ongoing value. Leaving stale data in Standard storage—designed for frequent access—results in unnecessary cost. If the data must be retained for compliance or future reference, colder tiers offer substantial savings. If it is no longer needed, the data should be deleted.