diff --git a/src/views/backups.html b/src/views/backups.html
index 97357971c..e55d8a0a6 100644
--- a/src/views/backups.html
+++ b/src/views/backups.html
@@ -276,6 +276,14 @@
                 </div>
               </div>
 
+              <div class="form-group">
+                <label class="control-label" for="memoryLimit" ng-show="s3like(configureBackup.provider)">Upload Part Size : <b>{{ configureBackup.uploadPartSize | prettyByteSize:'Default (50 MB)' }}</b></label>
+                <p class="small">Multi-part upload part size.</p>
+                <div style="padding: 0 10px;">
+                  <slider id="sliderConfigureBackupUploadPartSize" ng-model="configureBackup.uploadPartSize" step="1048576" tooltip="hide" ticks="configureBackup.uploadPartSizeTicks" ticks-snap-bounds="2097152"></slider>
+                </div>
+              </div>
+
               <div class="form-group" ng-show="configureBackup.format === 'rsync' && (s3like(configureBackup.provider) || configureBackup.provider === 'gcs')">
                 <label class="control-label">Upload Concurrency : <b>{{ configureBackup.syncConcurrency }}</b></label>
                 <p class="small">Number of files to upload in parallel when backing up</p>
diff --git a/src/views/backups.js b/src/views/backups.js
index 69c391697..24e5e9114 100644
--- a/src/views/backups.js
+++ b/src/views/backups.js
@@ -411,6 +411,8 @@ angular.module('Application').controller('BackupsController', ['$scope', '$locat
 
         memoryTicks: [],
         memoryLimit: 400 * 1024 * 1024,
+        uploadPartSizeTicks: [],
+        uploadPartSize: 50 * 1024 * 1024,
         copyConcurrency: '',
         downloadConcurrency: '',
         syncConcurrency: '', // sort of similar to upload
@@ -431,6 +433,8 @@ angular.module('Application').controller('BackupsController', ['$scope', '$locat
             $scope.configureBackup.externalDisk = false;
             $scope.configureBackup.memoryLimit = 400 * 1024 * 1024;
 
+            // scaleway only supports 1000 parts per object (https://www.scaleway.com/en/docs/s3-multipart-upload/)
+            $scope.configureBackup.uploadPartSize = $scope.configureBackup.provider === 'scaleway-objectstorage' ? 100 * 1024 * 1024 : 10 * 1024 * 1024;
             $scope.configureBackup.downloadConcurrency = $scope.configureBackup.provider === 's3' ? 30 : 10;
             $scope.configureBackup.syncConcurrency = $scope.configureBackup.provider === 's3' ? 20 : 10;
             $scope.configureBackup.copyConcurrency = $scope.configureBackup.provider === 's3' ? 500 : 10;
@@ -467,6 +471,7 @@ angular.module('Application').controller('BackupsController', ['$scope', '$locat
 
             $scope.configureBackup.memoryLimit = $scope.backupConfig.memoryLimit;
 
+            $scope.configureBackup.uploadPartSize = $scope.backupConfig.uploadPartSize || ($scope.configureBackup.provider === 'scaleway-objectstorage' ? 100 * 1024 * 1024 : 10 * 1024 * 1024);
             $scope.configureBackup.downloadConcurrency = $scope.backupConfig.downloadConcurrency || ($scope.backupConfig.provider === 's3' ? 30 : 10);
             $scope.configureBackup.syncConcurrency = $scope.backupConfig.syncConcurrency || ($scope.backupConfig.provider === 's3' ? 20 : 10);
             $scope.configureBackup.copyConcurrency = $scope.backupConfig.copyConcurrency || ($scope.backupConfig.provider === 's3' ? 500 : 10);
@@ -476,6 +481,12 @@ angular.module('Application').controller('BackupsController', ['$scope', '$locat
                 $scope.configureBackup.memoryTicks.push(i * 1024 * 1024);
             }
 
+            $scope.configureBackup.uploadPartSizeTicks = [ 10 * 1024 * 1024 ];
+            for (var j = 32; j <= 128; j *= 2) { // 5 GB is max for s3. but let's keep things practical for now
+                $scope.configureBackup.uploadPartSizeTicks.push(j * 1024 * 1024);
+            }
+
+
             $('#configureBackupModal').modal('show');
         },
 
@@ -557,6 +568,8 @@ angular.module('Application').controller('BackupsController', ['$scope', '$locat
                 backupConfig.externalDisk = $scope.configureBackup.externalDisk;
             }
 
+            backupConfig.uploadPartSize = $scope.configureBackup.uploadPartSize;
+
             if (backupConfig.format === 'rsync') {
                 backupConfig.downloadConcurrency = $scope.configureBackup.downloadConcurrency;
                 backupConfig.syncConcurrency = $scope.configureBackup.syncConcurrency;