diff --git a/proxmox/resource_vm_qemu.go b/proxmox/resource_vm_qemu.go
index bb241460..c4900fc5 100755
--- a/proxmox/resource_vm_qemu.go
+++ b/proxmox/resource_vm_qemu.go
@@ -3119,6 +3119,12 @@ func schema_DiskBackup() *schema.Schema {
 		Type:     schema.TypeBool,
 		Optional: true,
 		Default:  true,
+		// Convert previous integer values of 0/1 to booleans
+		StateFunc: func(val interface{}) string {
+			if val.(string) == "0" {return "false"}
+			if val.(string) == "1" {return "true"}
+			return val.(string)
+		},
 	}
 }