Explanation:

Azure Recovery Services vaults are used to store backup data and recovery points for supported workloads such as Azure VMs, Azure Files, and on-premises workloads. However, the configuration rules are strictly defined based on region and supported resource type.
From Microsoft Azure Administrator documentation and the official Azure Backup architecture, the following principles apply:
* Backup Region Dependency - A Recovery Services vault can only back up resources located in the same Azure region. For example, a vault in Central US can only back up Azure VMs, storage accounts, or workloads in Central US. It cannot back up resources in West US or East US.
* Vault1 (Central US, RG1)
* Located in Central US and can therefore back up only resources in Central US.
* From the table: VM1 is in Central US, and is eligible.
* storage1 (West US) and SQL1 (East US) cannot be backed up to Vault1 due to cross-region restrictions.
# Therefore, Vault1 can back up VM1 only.
* Vault2 (West US, RG2)
* Located in West US, and can only back up resources in West US.
* In West US, the only relevant resource is storage1, which contains a file share named share1.
Azure Backup supports Azure File share backup via Recovery Services vaults.
* Vault2 cannot back up VM1 (Central US) or SQL1 (East US) since they reside in different regions.
# Therefore, Vault2 can back up share1 only.
* Azure Backup Limitations Summary (From Microsoft Docs):
* Azure VMs # must be backed up to a vault in the same region.
* Azure File Shares # can be backed up using Recovery Services vaults in the same region as the storage account.
* Azure SQL Database # uses its own automated backup mechanism, not Recovery Services vaults.
Hence, by Azure documentation compliance and AZ-104 study guide principles:
* Vault1 backs up VM1 only.
* Vault2 backs up share1 only.
Final Verified Answer:
# Vault1 - VM1 only
# Vault2 - share1 only