diff --git a/CHANGELOG.md b/CHANGELOG.md
index df090ba35..7cdbd58c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -86,6 +86,8 @@
   - **Docs:** Extend description of `Roles` field in `CreateUserPayload`, `PartialUpdateUserPayload`, `UpdateUserPayload` and `User` model
 - `authorization`: [v0.11.0](services/authorization/CHANGELOG.md#v0110)
   - **Feature:** Add new methods for managing roles: `AddRole`, `DeleteRole`, `GetRole`, `UpdateRole`
+- `serverbackup`: [v1.3.5](services/serverbackup/CHANGELOG.md#v135)
+  - **Bugfix:** Update backup status codes to match the backup status codes actually returned by the server backup API
 
 ## Release (2025-12-05)
 - `alb`: 
diff --git a/services/serverbackup/CHANGELOG.md b/services/serverbackup/CHANGELOG.md
index 6b61cd2f6..a6e2e8040 100644
--- a/services/serverbackup/CHANGELOG.md
+++ b/services/serverbackup/CHANGELOG.md
@@ -1,3 +1,6 @@
+## v1.3.5
+- **Bugfix:** Update backup status codes to match the backup status codes actually returned by the server backup API
+
 ## v1.3.4
   - Bump STACKIT SDK core module from `v0.20.0` to `v0.20.1`
 
diff --git a/services/serverbackup/VERSION b/services/serverbackup/VERSION
index 2f933838e..3252f641b 100644
--- a/services/serverbackup/VERSION
+++ b/services/serverbackup/VERSION
@@ -1 +1 @@
-v1.3.4
\ No newline at end of file
+v1.3.5
diff --git a/services/serverbackup/model_backup.go b/services/serverbackup/model_backup.go
index ccb23a32c..5198f9857 100644
--- a/services/serverbackup/model_backup.go
+++ b/services/serverbackup/model_backup.go
@@ -155,28 +155,26 @@ type BackupStatus string
 
 // List of Status
 const (
-	BACKUPSTATUS_CREATING       BackupStatus = "creating"
-	BACKUPSTATUS_AVAILABLE      BackupStatus = "available"
-	BACKUPSTATUS_DELETING       BackupStatus = "deleting"
-	BACKUPSTATUS_ERROR          BackupStatus = "error"
-	BACKUPSTATUS_RESTORING      BackupStatus = "restoring"
-	BACKUPSTATUS_ERROR_DELETING BackupStatus = "error_deleting"
-	BACKUPSTATUS_BACKING_UP     BackupStatus = "backing up"
-	BACKUPSTATUS_INCONSISTENT   BackupStatus = "inconsistent"
-	BACKUPSTATUS_ERROR_CREATING BackupStatus = "error-creating"
+	BACKUPSTATUS_IN_PROGRESS     BackupStatus = "in-progress"
+	BACKUPSTATUS_INCONSISTENT    BackupStatus = "inconsistent"
+	BACKUPSTATUS_AVAILABLE       BackupStatus = "available"
+	BACKUPSTATUS_ERROR           BackupStatus = "error"
+	BACKUPSTATUS_ERROR_RESTORING BackupStatus = "error-restoring"
+	BACKUPSTATUS_ERROR_CREATING  BackupStatus = "error-creating"
+	BACKUPSTATUS_ERROR_DELETING  BackupStatus = "error-deleting"
+	BACKUPSTATUS_UNRECOGNIZED    BackupStatus = "unrecognized"
 )
 
 // All allowed values of Backup enum
 var AllowedBackupStatusEnumValues = []BackupStatus{
-	"creating",
+	"in-progress",
+	"inconsistent",
 	"available",
-	"deleting",
 	"error",
-	"restoring",
-	"error_deleting",
-	"backing up",
-	"inconsistent",
+	"error-restoring",
 	"error-creating",
+	"error-deleting",
+	"unrecognized",
 }
 
 func (v *BackupStatus) UnmarshalJSON(src []byte) error {
diff --git a/services/serverbackup/model_backup_test.go b/services/serverbackup/model_backup_test.go
index f08aabd22..3479963b0 100644
--- a/services/serverbackup/model_backup_test.go
+++ b/services/serverbackup/model_backup_test.go
@@ -28,21 +28,21 @@ func TestBackupStatus_UnmarshalJSON(t *testing.T) {
 		{
 			name: `success - possible enum value no. 1`,
 			args: args{
-				src: []byte(`"creating"`),
+				src: []byte(`"in-progress"`),
 			},
 			wantErr: false,
 		},
 		{
 			name: `success - possible enum value no. 2`,
 			args: args{
-				src: []byte(`"available"`),
+				src: []byte(`"inconsistent"`),
 			},
 			wantErr: false,
 		},
 		{
 			name: `success - possible enum value no. 3`,
 			args: args{
-				src: []byte(`"deleting"`),
+				src: []byte(`"available"`),
 			},
 			wantErr: false,
 		},
@@ -56,35 +56,28 @@ func TestBackupStatus_UnmarshalJSON(t *testing.T) {
 		{
 			name: `success - possible enum value no. 5`,
 			args: args{
-				src: []byte(`"restoring"`),
+				src: []byte(`"error-restoring"`),
 			},
 			wantErr: false,
 		},
 		{
 			name: `success - possible enum value no. 6`,
 			args: args{
-				src: []byte(`"error_deleting"`),
+				src: []byte(`"error-creating"`),
 			},
 			wantErr: false,
 		},
 		{
 			name: `success - possible enum value no. 7`,
 			args: args{
-				src: []byte(`"backing up"`),
+				src: []byte(`"error-deleting"`),
 			},
 			wantErr: false,
 		},
 		{
 			name: `success - possible enum value no. 8`,
 			args: args{
-				src: []byte(`"inconsistent"`),
-			},
-			wantErr: false,
-		},
-		{
-			name: `success - possible enum value no. 9`,
-			args: args{
-				src: []byte(`"error-creating"`),
+				src: []byte(`"unrecognized"`),
 			},
 			wantErr: false,
 		},
diff --git a/services/serverbackup/model_backup_volume_backups_inner.go b/services/serverbackup/model_backup_volume_backups_inner.go
index 72b565c69..806e74bc0 100644
--- a/services/serverbackup/model_backup_volume_backups_inner.go
+++ b/services/serverbackup/model_backup_volume_backups_inner.go
@@ -113,24 +113,28 @@ type BackupVolumeBackupsInnerStatus string
 
 // List of Status
 const (
-	BACKUPVOLUMEBACKUPSINNERSTATUS_CREATING       BackupVolumeBackupsInnerStatus = "creating"
-	BACKUPVOLUMEBACKUPSINNERSTATUS_AVAILABLE      BackupVolumeBackupsInnerStatus = "available"
-	BACKUPVOLUMEBACKUPSINNERSTATUS_DELETING       BackupVolumeBackupsInnerStatus = "deleting"
-	BACKUPVOLUMEBACKUPSINNERSTATUS_ERROR          BackupVolumeBackupsInnerStatus = "error"
-	BACKUPVOLUMEBACKUPSINNERSTATUS_RESTORING      BackupVolumeBackupsInnerStatus = "restoring"
-	BACKUPVOLUMEBACKUPSINNERSTATUS_ERROR_DELETING BackupVolumeBackupsInnerStatus = "error_deleting"
-	BACKUPVOLUMEBACKUPSINNERSTATUS_ERROR_CREATING BackupVolumeBackupsInnerStatus = "error-creating"
+	BACKUPVOLUMEBACKUPSINNERSTATUS_AVAILABLE       BackupVolumeBackupsInnerStatus = "available"
+	BACKUPVOLUMEBACKUPSINNERSTATUS_CREATING        BackupVolumeBackupsInnerStatus = "creating"
+	BACKUPVOLUMEBACKUPSINNERSTATUS_DELETING        BackupVolumeBackupsInnerStatus = "deleting"
+	BACKUPVOLUMEBACKUPSINNERSTATUS_ERROR_DELETING  BackupVolumeBackupsInnerStatus = "error-deleting"
+	BACKUPVOLUMEBACKUPSINNERSTATUS_ERROR           BackupVolumeBackupsInnerStatus = "error"
+	BACKUPVOLUMEBACKUPSINNERSTATUS_ERROR_RESTORING BackupVolumeBackupsInnerStatus = "error-restoring"
+	BACKUPVOLUMEBACKUPSINNERSTATUS_RESTORING       BackupVolumeBackupsInnerStatus = "restoring"
+	BACKUPVOLUMEBACKUPSINNERSTATUS_ERROR_CREATING  BackupVolumeBackupsInnerStatus = "error-creating"
+	BACKUPVOLUMEBACKUPSINNERSTATUS_UNRECOGNIZED    BackupVolumeBackupsInnerStatus = "unrecognized"
 )
 
 // All allowed values of BackupVolumeBackupsInner enum
 var AllowedBackupVolumeBackupsInnerStatusEnumValues = []BackupVolumeBackupsInnerStatus{
-	"creating",
 	"available",
+	"creating",
 	"deleting",
+	"error-deleting",
 	"error",
+	"error-restoring",
 	"restoring",
-	"error_deleting",
 	"error-creating",
+	"unrecognized",
 }
 
 func (v *BackupVolumeBackupsInnerStatus) UnmarshalJSON(src []byte) error {
diff --git a/services/serverbackup/model_backup_volume_backups_inner_test.go b/services/serverbackup/model_backup_volume_backups_inner_test.go
index 7297161f2..e68a4fc53 100644
--- a/services/serverbackup/model_backup_volume_backups_inner_test.go
+++ b/services/serverbackup/model_backup_volume_backups_inner_test.go
@@ -28,14 +28,14 @@ func TestBackupVolumeBackupsInnerStatus_UnmarshalJSON(t *testing.T) {
 		{
 			name: `success - possible enum value no. 1`,
 			args: args{
-				src: []byte(`"creating"`),
+				src: []byte(`"available"`),
 			},
 			wantErr: false,
 		},
 		{
 			name: `success - possible enum value no. 2`,
 			args: args{
-				src: []byte(`"available"`),
+				src: []byte(`"creating"`),
 			},
 			wantErr: false,
 		},
@@ -49,31 +49,45 @@ func TestBackupVolumeBackupsInnerStatus_UnmarshalJSON(t *testing.T) {
 		{
 			name: `success - possible enum value no. 4`,
 			args: args{
-				src: []byte(`"error"`),
+				src: []byte(`"error-deleting"`),
 			},
 			wantErr: false,
 		},
 		{
 			name: `success - possible enum value no. 5`,
 			args: args{
-				src: []byte(`"restoring"`),
+				src: []byte(`"error"`),
 			},
 			wantErr: false,
 		},
 		{
 			name: `success - possible enum value no. 6`,
 			args: args{
-				src: []byte(`"error_deleting"`),
+				src: []byte(`"error-restoring"`),
 			},
 			wantErr: false,
 		},
 		{
 			name: `success - possible enum value no. 7`,
+			args: args{
+				src: []byte(`"restoring"`),
+			},
+			wantErr: false,
+		},
+		{
+			name: `success - possible enum value no. 8`,
 			args: args{
 				src: []byte(`"error-creating"`),
 			},
 			wantErr: false,
 		},
+		{
+			name: `success - possible enum value no. 9`,
+			args: args{
+				src: []byte(`"unrecognized"`),
+			},
+			wantErr: false,
+		},
 		{
 			name: "fail",
 			args: args{