diff --git a/webauthn/helpers/parse_backup_flags.py b/webauthn/helpers/parse_backup_flags.py
index 05f0868..216e836 100644
--- a/webauthn/helpers/parse_backup_flags.py
+++ b/webauthn/helpers/parse_backup_flags.py
@@ -1,24 +1,10 @@
 from enum import Enum
 from pydantic import BaseModel
 
-from .structs import AuthenticatorDataFlags
+from .structs import AuthenticatorDataFlags, CredentialDeviceType
 from .exceptions import InvalidBackupFlags
 
 
-class CredentialDeviceType(str, Enum):
-    """A determination of the number of devices a credential can be used from
-
-    Members:
-        `SINGLE_DEVICE`: A credential that is bound to a single device
-        `MULTI_DEVICE`: A credential that can be used from multiple devices (e.g. passkeys)
-
-    https://w3c.github.io/webauthn/#sctn-credential-backup (L3 Draft)
-    """
-
-    SINGLE_DEVICE = "single_device"
-    MULTI_DEVICE = "multi_device"
-
-
 class ParsedBackupFlags(BaseModel):
     credential_device_type: CredentialDeviceType
     credential_backed_up: bool
diff --git a/webauthn/helpers/structs.py b/webauthn/helpers/structs.py
index 1fd801c..23f12ed 100644
--- a/webauthn/helpers/structs.py
+++ b/webauthn/helpers/structs.py
@@ -56,6 +56,7 @@ def _validate_bytes_fields(cls, v, field: ModelField):
             # values
             return v
 
+
 ################
 #
 # Fundamental data structures
@@ -545,3 +546,24 @@ class AuthenticationCredential(WebAuthnBaseModel):
     type: Literal[
         PublicKeyCredentialType.PUBLIC_KEY
     ] = PublicKeyCredentialType.PUBLIC_KEY
+
+
+################
+#
+# Credential Backup State
+#
+################
+
+
+class CredentialDeviceType(str, Enum):
+    """A determination of the number of devices a credential can be used from
+
+    Members:
+        `SINGLE_DEVICE`: A credential that is bound to a single device
+        `MULTI_DEVICE`: A credential that can be used from multiple devices (e.g. passkeys)
+
+    https://w3c.github.io/webauthn/#sctn-credential-backup (L3 Draft)
+    """
+
+    SINGLE_DEVICE = "single_device"
+    MULTI_DEVICE = "multi_device"