For Hyper-V machines, Site Recovery creates and uses a storage account for replication. By default, the test failover or failover happens on a storage account. However, it provides an option to failover to managed disks if required. In this case, managed disks are created at the time of failover Cache storage account: The Site Recovery provider software installed on Hyper-V hosts uploads replication data for the VMs configured for replication to a storage account (known as the cache storage account or log storage account) in your subscription. Azure Migrate and Modernize then copies the uploaded replication data from the storage account to the replica-managed disks corresponding to the VM. The cache storage account needs to be specified while configuring replication for a VM
Hyper-V Machines: The cache storage account is in the target that is in Azure charged at General Purpose Storage Account pricing as per the user's selection.
https://azure.microsoft.com/en-us/pricing/calculator/?service=site-recovery For cost You can deploy Hyper-V-deployment-planner-cost-estimation, please find the Link below.
https://learn.microsoft.com/en-us/azure/site-recovery/hyper-v-deployment-planner-cost-estimation
let us know if you have any further queries. I’m happy to assist you further.
Please do not forget to "Accept the answer” and “upvote it” wherever the information provided helps you, this can be beneficial to other community members.it would be greatly appreciated and helpful to others.