Several weeks ago, I was working with a Microsoft Partner to plan an Azure Backup solution and I discovered a change that could impact your Azure billing.
Here a video to initiate Azure Backup Creation:
Previously, when you created a backup vault you had the option to select locally redundant storage (LRS) or geo-redundant storage (GRS). This has now changed and you do not have the option during the vault creation.
Now, by default, your vault will be created in a GRS, which costs more than LRS. If you want to switch to LRS, you must do so after the vault has been created but prior to registering any items to the vault.
To do this, simply access the Configure tab of your backup vault and change the replication from the default of GRS to LRS.
Do not forget to click Save.