Azure Blob prefered tier for o365

Hi Nikos,

Cool would probably be best here.

While you could save even more money with straight Cold, you would have to contend with longer restore times (due to recalling).

Hi @Nikos.Kyrm 

You can use cool storage for a secondary copy, but not for a primary copy:

https://documentation.commvault.com/2023e/essential/use_express_configuration_option_in_office_365_guided_setup_for_exchange_online.html

I think this limitation only applies to Metallic Recovery Reserve / Air Gap protect rather than bringing your own storage.

Here are the pay-as-you-go prices, also with cold tier:
 

https://azure.microsoft.com/en-us/pricing/details/storage/blobs/

So, except from minimum required days, is there any other differences between tiers? For example speed?

Hot tier - An online tier optimized for storing data that is accessed or modified frequently. The hot tier has the highest storage costs, but the lowest access costs.
Cool tier - An online tier optimized for storing data that is infrequently accessed or modified. Data in the cool tier should be stored for a minimum of 30 days. The cool tier has lower storage costs and higher access costs compared to the hot tier.
Cold tier - An online tier optimized for storing data that is rarely accessed or modified, but still requires fast retrieval. Data in the cold tier should be stored for a minimum of 90 days. The cold tier has lower storage costs and higher access costs compared to the cool tier.

https://learn.microsoft.com/en-us/azure/storage/blobs/access-tiers-overview

@Nikos.Kyrm From my understanding the performance is similiar. All three have milliseconds latency while archive has hours due to rehydration. Hot has 99.9% availability while cool and cold has 99%

You need to beware of the increased cost of writes and reads of cool. I have not looked at cold, but prices for write/read would be higher from here.

If you store and read 1 TB from cool, Total cost is the same pr month as store and read 1 TB from Hot.

Aux copies/sfulls and restores will increase read and data retrival costs.

Hot gives you predictable costs, while cold can give you varying costs (potentially higher than hot). I assume this is the main reason for recommending primary copy on hot tier. Not a technical limitation.