diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5d834e8..d4ebfcc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 0.9.31 (2026-03-05)
+
+- Support zip backup file archive format.
+
 ## 0.9.30 (2026-02-03)
 
 - Support backup and restore schedules.
diff --git a/python/mujinwebstackclient/version.py b/python/mujinwebstackclient/version.py
index d2e8298..a9877ff 100644
--- a/python/mujinwebstackclient/version.py
+++ b/python/mujinwebstackclient/version.py
@@ -1,3 +1,3 @@
-__version__ = '0.9.30'
+__version__ = '0.9.31'
 
 # Do not forget to update CHANGELOG.md
diff --git a/python/mujinwebstackclient/webstackclient.py b/python/mujinwebstackclient/webstackclient.py
index 233d3d6..5828990 100644
--- a/python/mujinwebstackclient/webstackclient.py
+++ b/python/mujinwebstackclient/webstackclient.py
@@ -1070,7 +1070,24 @@ def DeleteAllITLPrograms(self, timeout=5):
     # Backup restore
     #
 
-    def Backup(self, saveconfig=True, savemedia=True, backupscenepks=None, backupSceneFormat=None, savewebapps=True, saveitl=True, savedetection=False, savestate=True, savecalibration=False, savedebug=False, saveeds=True, saveiodd=True, saveschedule=True, timeout=600):
+    def Backup(
+        self,
+        saveconfig=True,
+        savemedia=True,
+        backupscenepks=None,
+        backupSceneFormat=None,
+        savewebapps=True,
+        saveitl=True,
+        savedetection=False,
+        savestate=True,
+        savecalibration=False,
+        savedebug=False,
+        saveeds=True,
+        saveiodd=True,
+        saveschedule=True,
+        archiveFormat='tar.gz',
+        timeout=600,
+    ):
         """Downloads a backup file
 
         :param saveconfig: Whether we want to include configs in the backup, defaults to True
@@ -1086,6 +1103,7 @@ def Backup(self, saveconfig=True, savemedia=True, backupscenepks=None, backupSce
         :param saveschedule: Whether we want to include schedules in the backup, defaults to True
         :param backupscenepks: List of scenes to backup, defaults to None
         :param backupSceneFormat: The scene format to use in backup files, defaults to None
+        :param archiveFormat: The backup file archive format, supported values are tar.gz and zip, defaults to tar.gz
         :param timeout: Amount of time in seconds to wait before failing, defaults to 600
         :raises WebstackClientError: If request wasn't successful
         :return: A streaming response to the backup file
@@ -1108,6 +1126,7 @@ def Backup(self, saveconfig=True, savemedia=True, backupscenepks=None, backupSce
                 'schedule': 'true' if saveschedule else 'false',
                 'backupScenePks': ','.join(backupscenepks) if backupscenepks else None,
                 'backupSceneFormat': backupSceneFormat,
+                'archiveFormat': archiveFormat,
             },
             timeout=timeout,
         )
@@ -1115,7 +1134,19 @@ def Backup(self, saveconfig=True, savemedia=True, backupscenepks=None, backupSce
             raise WebstackClientError(response.content.decode('utf-8'), response=response.content)
         return response
 
-    def Restore(self, file, restoreconfig=True, restoremedia=True, restorewebapps=True, restoreitl=True, restoreeds=True, restoreiodd=True, restoreschedule=True, timeout=600):
+    def Restore(
+        self,
+        file,
+        restoreconfig=True,
+        restoremedia=True,
+        restorewebapps=True,
+        restoreitl=True,
+        restoreeds=True,
+        restoreiodd=True,
+        restoreschedule=True,
+        archiveFormat=None,
+        timeout=600,
+    ):
         """Uploads a previously downloaded backup file to restore
 
         :param file: Backup filer in tarball format
@@ -1126,6 +1157,7 @@ def Restore(self, file, restoreconfig=True, restoremedia=True, restorewebapps=Tr
         :param restoreeds: Whether we want to restore the eds files, defaults to True
         :param restoreiodd: Whether we want to restore the iodd files, defaults to True
         :param restoreschedule: Whether we want to restore the schedules, defaults to True
+        :param archiveFormat: The backup file archive format, supported values are tar.gz and zip, defaults to None
         :param timeout: Amount of time in seconds to wait before failing, defaults to 600
         :raises WebstackClientError: If request wasn't successful
         :return: JSON response
@@ -1142,6 +1174,7 @@ def Restore(self, file, restoreconfig=True, restoremedia=True, restorewebapps=Tr
                 'eds': 'true' if restoreeds else 'false',
                 'iodd': 'true' if restoreiodd else 'false',
                 'schedule': 'true' if restoreschedule else 'false',
+                'archiveFormat': archiveFormat,
             },
             timeout=timeout,
         )