GCP Costing Standard even though Bucket's default class is Archive

[marzia]

When in trial, we used GCP bucket for Synology Hyper Backup. Everything went smoothly but now we realise that it's been uploading to Standard class instead of Archive class as bucket's default config. Can somebody shed light on this problem?

[robertcarlos · Accepted solution]

Hi @marzia,

Welcome to Google Cloud Community!

Please check if autoclass is enabled on your Google Cloud Storage bucket. If enabled, storage class will transitioned from archive to standard.

Based on this documentation on Autoclass, objects at least 128 KiB in size transition between storage classes as follows:

• If an object's data is accessed, the object transitions to Standard storage.

If the bucket is configured to use Archive storage as the terminal storage class, objects continue to transition to colder storage classes as follows:

• Any object that isn't accessed for 90 days transitions to Coldline storage. Such objects spent at least 30 days in Standard storage and 60 days in Nearline storage.

• Any object that isn't accessed for 365 days transitions to Archive storage. Such objects spent at least 30 days in Standard storage, 60 days in Nearline storage and 275 days in Coldline storage.

• Autoclass only changes the state of an object stored in Archive storage if that object is accessed.

Please be advised that archive storage has the longest minimum storage duration which is 365 days. If your setup is configured to access your bucket within 365 days or shorter and Autoclass is enabled, it will then be transitioned from archived to any other class (coldline, nearline, standard) depending on the duration. Archive storage class is best used when the bucket is accessed less than once per 365 days. 

Hope this helps.