diff --git a/storage_s3/README.md b/storage_s3/README.md
index 0ff9391b..74ae9ffd 100644
--- a/storage_s3/README.md
+++ b/storage_s3/README.md
@@ -15,6 +15,11 @@ to local storage (but it would of course be possible to write a script for this)
 
 ## Changelog
 
+### 3.3.1
+
+- Adapt to Indico 3.3.5 changes
+- Add file import handler for event export/import operations that require copying many files on S3
+
 ### 3.3
 
 - Support (and require) Python 3.12
diff --git a/storage_s3/indico_storage_s3/import_event_files.py b/storage_s3/indico_storage_s3/import_event_files.py
new file mode 100644
index 00000000..06ddfe2f
--- /dev/null
+++ b/storage_s3/indico_storage_s3/import_event_files.py
@@ -0,0 +1,57 @@
+# This file is part of the Indico plugins.
+# Copyright (C) 2002 - 2024 CERN
+#
+# The Indico plugins are free software; you can redistribute
+# them and/or modify them under the terms of the MIT License;
+# see the LICENSE file for more details.
+
+# XXX: This module is not as unused as it may appear. It can be referenced in
+# the `indico event import-files` command when all files are on S3 and one wants
+# to do a fast copy using rclone
+
+import subprocess
+import sys
+
+import click
+
+from indico.core.storage.backend import Storage, get_storage
+
+from indico.util.console import verbose_iterator
+from indico_storage_s3.storage import S3StorageBase
+
+
+def copy_files(mapping, backends):
+    target_backend_names = list({x[1][0] for x in mapping})
+    assert len(target_backend_names) == 1
+    target_backend: Storage = get_storage(target_backend_names[0])
+    click.echo(f'Target backend: {target_backend_names[0]} ({target_backend.name})')
+    if not isinstance(target_backend, S3StorageBase):
+        click.echo('Target backend is not S3; aborting')
+        sys.exit(1)
+    if not all(isinstance(x, S3StorageBase) for x in backends.values()):
+        click.echo('Not all source backends are S3; aborting')
+        sys.exit(1)
+    rclone_remote_name = click.prompt('rclone remote name')
+    mapping.sort()
+    iterator = verbose_iterator(mapping, len(mapping), get_title=lambda x: x[1][1], print_every=1,
+                                print_total_time=True)
+    for (source_backend_name, source_file_id), (__, target_file_id) in iterator:
+        source_backend: S3StorageBase = backends[source_backend_name]
+        _run_rclone(
+            rclone_remote_name,
+            '/'.join(source_backend._parse_file_id(source_file_id)),
+            '/'.join(target_backend._parse_file_id(target_file_id)),
+        )
+
+
+def _run_rclone(remote, src, dst):
+    subprocess.check_call(
+        [
+            'rclone',
+            '--s3-no-check-bucket',
+            '--s3-acl=bucket-owner-full-control',
+            'copyto',
+            f'{remote}:{src}',
+            f'{remote}:{dst}',
+        ]
+    )
diff --git a/storage_s3/indico_storage_s3/storage.py b/storage_s3/indico_storage_s3/storage.py
index 34bee766..3e116f72 100644
--- a/storage_s3/indico_storage_s3/storage.py
+++ b/storage_s3/indico_storage_s3/storage.py
@@ -204,10 +204,10 @@ def _get_current_bucket_name(self):
     def _parse_file_id(self, file_id):
         return self.bucket_name, file_id
 
-    def save(self, name, content_type, filename, fileobj):
+    def save(self, name, content_type, filename, fileobj, *, dry_run=False):
         try:
             bucket = self._get_current_bucket_name()
-            checksum = self._save(bucket, name, content_type, fileobj)
+            checksum = self._save(bucket, name, content_type, fileobj) if not dry_run else None
             return name, checksum
         except Exception as exc:
             raise StorageError(f'Could not save "{name}": {exc}') from exc
@@ -250,10 +250,10 @@ def _replace_bucket_placeholders(self, name, date):
         name = name.replace('<month>', date.strftime('%m'))
         return name.replace('<week>', date.strftime('%W'))
 
-    def save(self, name, content_type, filename, fileobj):
+    def save(self, name, content_type, filename, fileobj, *, dry_run=False):
         try:
             bucket = self._get_current_bucket_name()
-            checksum = self._save(bucket, name, content_type, fileobj)
+            checksum = self._save(bucket, name, content_type, fileobj) if not dry_run else None
             file_id = f'{bucket}//{name}'
             return file_id, checksum
         except Exception as exc:
diff --git a/storage_s3/pyproject.toml b/storage_s3/pyproject.toml
index 74a63088..9caea844 100644
--- a/storage_s3/pyproject.toml
+++ b/storage_s3/pyproject.toml
@@ -2,7 +2,7 @@
 name = 'indico-plugin-storage-s3'
 description = 'S3 storage backend for Indico'
 readme = 'README.md'
-version = '3.3'
+version = '3.3.1'
 license = 'MIT'
 authors = [{ name = 'Indico Team', email = 'indico-team@cern.ch' }]
 classifiers = [