diff --git a/CHANGES b/CHANGES
index 3be64a6f2..bede9a1d6 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2072,3 +2072,5 @@
 * Fix issue where the long mongodb database names where causing app indices of rocket.chat to overflow (> 127)
 * Do not resize swap if swap file exists. This means that users can now control how swap is allocated on their own.
 * SFTP: fix issue where parallel rebuilds would cause an error
+* backups: make part size configurable
+
diff --git a/src/routes/settings.js b/src/routes/settings.js
index 5ae4a60c3..2c91ac767 100644
--- a/src/routes/settings.js
+++ b/src/routes/settings.js
@@ -115,6 +115,11 @@ function setBackupConfig(req, res, next) {
         if (typeof req.body.deleteConcurrency !== 'number') return next(new HttpError(400, 'deleteConcurrency must be a positive integer'));
         if (req.body.deleteConcurrency < 1) return next(new HttpError(400, 'deleteConcurrency must be a positive integer'));
     }
+    if ('uploadPartSize' in req.body) {
+        if (typeof req.body.uploadPartSize !== 'number') return next(new HttpError(400, 'uploadPartSize must be a positive integer'));
+        if (req.body.uploadPartSize < 1) return next(new HttpError(400, 'uploadPartSize must be a positive integer'));
+    }
+
     if ('memoryLimit' in req.body && typeof req.body.memoryLimit !== 'number') return next(new HttpError(400, 'memoryLimit must be a positive integer'));
     if (typeof req.body.format !== 'string') return next(new HttpError(400, 'format must be a string'));
     if ('acceptSelfSignedCerts' in req.body && typeof req.body.acceptSelfSignedCerts !== 'boolean') return next(new HttpError(400, 'format must be a boolean'));
diff --git a/src/settings.js b/src/settings.js
index 8da128923..0e8e4b782 100644
--- a/src/settings.js
+++ b/src/settings.js
@@ -446,7 +446,7 @@ function setBackupCredentials(credentials, callback) {
         if (error) return callback(error);
 
         // preserve these fields
-        const extra = _.pick(currentConfig, 'retentionPolicy', 'schedulePattern', 'copyConcurrency', 'syncConcurrency', 'memoryLimit', 'downloadConcurrency', 'deleteConcurrency');
+        const extra = _.pick(currentConfig, 'retentionPolicy', 'schedulePattern', 'copyConcurrency', 'syncConcurrency', 'memoryLimit', 'downloadConcurrency', 'deleteConcurrency', 'uploadPartSize');
 
         const backupConfig = _.extend({}, credentials, extra);
 
diff --git a/src/storage/s3.js b/src/storage/s3.js
index 978d03a60..40e408d22 100644
--- a/src/storage/s3.js
+++ b/src/storage/s3.js
@@ -121,7 +121,7 @@ function upload(apiConfig, backupFilePath, sourceStream, callback) {
         // s3.upload automatically does a multi-part upload. we set queueSize to 3 to reduce memory usage
         // uploader will buffer at most queueSize * partSize bytes into memory at any given time.
         // scaleway only supports 1000 parts per object (https://www.scaleway.com/en/docs/s3-multipart-upload/)
-        const partSize = apiConfig.provider === 'scaleway-objectstorage' ? 100 * 1024 * 1024 : 10 * 1024 * 1024;
+        const partSize = apiConfig.uploadPartSize || (apiConfig.provider === 'scaleway-objectstorage' ? 100 * 1024 * 1024 : 10 * 1024 * 1024);
 
         s3.upload(params, { partSize, queueSize: 3 }, function (error, data) {
             if (error) {