Hello Roa Augusto,
Currently, Azure does not support migrating recovery points from one Recovery Services Vault to another, even across subscriptions. Recovery points are tightly bound to the vault in which they were created and cannot be transferred or exported to another vault or subscription.
However, If you want to keep the existing restore points from the old vault and configure the backups for the existing VM's, you can stop the backups with retain backup data and move your VM from one Resource group to other resource group. so by doing this you will be keeping the existing restore points in the old vault and you will be having the new backups with the new vault.
Additionally, you can move the vault Across Subscriptions (If Within Same Tenant)
- If the old and new subscriptions are under the same Azure Active Directory (AAD) tenant, you can move the entire Recovery Services Vault to the new subscription using the Azure Portal or PowerShell.
- This preserves all recovery points and backup policies.
- Important:
- The vault must not contain unsupported backup item types.
- The vault and VMs must be in the same region.
- You must have write permissions on the target resource group.
- The vault’s location cannot be changed during the move.
you can refer this official document:
https://learn.microsoft.com/en-us/azure/backup/backup-azure-move-recovery-services-vault
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