diff --git a/src/routes/settings.js b/src/routes/settings.js
index 7903f435e..5ae4a60c3 100644
--- a/src/routes/settings.js
+++ b/src/routes/settings.js
@@ -111,6 +111,10 @@ function setBackupConfig(req, res, next) {
         if (typeof req.body.downloadConcurrency !== 'number') return next(new HttpError(400, 'downloadConcurrency must be a positive integer'));
         if (req.body.downloadConcurrency < 1) return next(new HttpError(400, 'downloadConcurrency must be a positive integer'));
     }
+    if ('deleteConcurrency' in req.body) {
+        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 ('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 1468954d1..8bf0f8720 100644
--- a/src/settings.js
+++ b/src/settings.js
@@ -437,7 +437,7 @@ function setBackupCredentials(credentials, callback) {
         if (error) return callback(error);
 
         // preserve these fields
-        const extra = _.pick(currentConfig, 'retentionPolicy', 'schedulePattern', 'copyConcurrency', 'syncConcurrency', 'memoryLimit', 'downloadConcurrency');
+        const extra = _.pick(currentConfig, 'retentionPolicy', 'schedulePattern', 'copyConcurrency', 'syncConcurrency', 'memoryLimit', 'downloadConcurrency', 'deleteConcurrency');
 
         const backupConfig = _.extend({}, credentials, extra);
 
diff --git a/src/storage/s3.js b/src/storage/s3.js
index 014dc5a05..978d03a60 100644
--- a/src/storage/s3.js
+++ b/src/storage/s3.js
@@ -396,7 +396,7 @@ function removeDir(apiConfig, pathPrefix) {
         listDir(apiConfig, pathPrefix, 1000, function listDirIterator(entries, done) {
             total += entries.length;
 
-            const chunkSize = apiConfig.provider !== 'digitalocean-spaces' ? 1000 : 100; // throttle objects in each request
+            const chunkSize = apiConfig.deleteConcurrency || (apiConfig.provider !== 'digitalocean-spaces' ? 1000 : 100); // throttle objects in each request
             var chunks = chunk(entries, chunkSize);
 
             async.eachSeries(chunks, function deleteFiles(objects, iteratorCallback) {