diff --git a/services/backup/docker-server/contents/server/src/DatabaseManager.cpp b/services/backup/docker-server/contents/server/src/DatabaseManager.cpp
index f6fe0394b..e4e17380a 100644
--- a/services/backup/docker-server/contents/server/src/DatabaseManager.cpp
+++ b/services/backup/docker-server/contents/server/src/DatabaseManager.cpp
@@ -1,167 +1,169 @@
 #include "DatabaseManager.h"
 #include "Constants.h"
 #include "Tools.h"
 
 #include <aws/core/utils/Outcome.h>
 #include <aws/dynamodb/model/DeleteItemRequest.h>
 #include <aws/dynamodb/model/QueryRequest.h>
 #include <aws/dynamodb/model/ScanRequest.h>
 
 #include <iostream>
 
 namespace comm {
 namespace network {
 namespace database {
 
 DatabaseManager &DatabaseManager::getInstance() {
   static DatabaseManager instance;
   return instance;
 }
 
 void DatabaseManager::innerPutItem(
     std::shared_ptr<Item> item,
     const Aws::DynamoDB::Model::PutItemRequest &request) {
   const Aws::DynamoDB::Model::PutItemOutcome outcome =
       getDynamoDBClient()->PutItem(request);
   if (!outcome.IsSuccess()) {
     throw std::runtime_error(outcome.GetError().GetMessage());
   }
 }
 
 void DatabaseManager::innerRemoveItem(const Item &item) {
   Aws::DynamoDB::Model::DeleteItemRequest request;
   request.SetTableName(item.getTableName());
   PrimaryKey pk = item.getPrimaryKey();
   PrimaryKeyValue primaryKeyValue = item.getPrimaryKeyValue();
   request.AddKey(
       pk.partitionKey,
       Aws::DynamoDB::Model::AttributeValue(primaryKeyValue.partitionKey));
   if (pk.sortKey != nullptr && primaryKeyValue.sortKey != nullptr) {
     request.AddKey(
         *pk.sortKey,
         Aws::DynamoDB::Model::AttributeValue(*primaryKeyValue.sortKey));
   }
 
   const Aws::DynamoDB::Model::DeleteItemOutcome &outcome =
       getDynamoDBClient()->DeleteItem(request);
   if (!outcome.IsSuccess()) {
     throw std::runtime_error(outcome.GetError().GetMessage());
   }
 }
 
 void DatabaseManager::putBackupItem(const BackupItem &item) {
   Aws::DynamoDB::Model::PutItemRequest request;
   request.SetTableName(BackupItem::tableName);
   request.AddItem(
       BackupItem::FIELD_USER_ID,
       Aws::DynamoDB::Model::AttributeValue(item.getUserID()));
   request.AddItem(
       BackupItem::FIELD_CREATED,
       Aws::DynamoDB::Model::AttributeValue(
           std::to_string(getCurrentTimestamp())));
   request.AddItem(
       BackupItem::FIELD_BACKUP_ID,
       Aws::DynamoDB::Model::AttributeValue(item.getBackupID()));
   request.AddItem(
       BackupItem::FIELD_RECOVERY_DATA,
       Aws::DynamoDB::Model::AttributeValue(item.getRecoveryData()));
   request.AddItem(
       BackupItem::FIELD_COMPACTION_HOLDER,
       Aws::DynamoDB::Model::AttributeValue(item.getCompactionHolder()));
-  request.AddItem(
-      BackupItem::FIELD_ATTACHMENT_HOLDERS,
-      Aws::DynamoDB::Model::AttributeValue(item.getAttachmentHolders()));
+  if (!item.getAttachmentHolders().empty()) {
+    request.AddItem(
+        BackupItem::FIELD_ATTACHMENT_HOLDERS,
+        Aws::DynamoDB::Model::AttributeValue(item.getAttachmentHolders()));
+  }
 
   this->innerPutItem(std::make_shared<BackupItem>(item), request);
 }
 
 std::shared_ptr<BackupItem>
 DatabaseManager::findLastBackupItem(const std::string &userID) {
   std::shared_ptr<BackupItem> item = createItemByType<BackupItem>();
 
   Aws::DynamoDB::Model::QueryRequest req;
   req.SetTableName(BackupItem::tableName);
   req.SetKeyConditionExpression(BackupItem::FIELD_USER_ID + " = :valueToMatch");
 
   AttributeValues attributeValues;
   attributeValues.emplace(":valueToMatch", userID);
 
   req.SetExpressionAttributeValues(attributeValues);
   req.SetIndexName("userID-created-index");
 
   req.SetLimit(1);
   req.SetScanIndexForward(false);
 
   const Aws::DynamoDB::Model::QueryOutcome &outcome =
       getDynamoDBClient()->Query(req);
   if (!outcome.IsSuccess()) {
     throw std::runtime_error(outcome.GetError().GetMessage());
   }
   const Aws::Vector<AttributeValues> &items = outcome.GetResult().GetItems();
   if (items.empty()) {
     return nullptr;
   }
   return std::make_shared<database::BackupItem>(items[0]);
 }
 
 void DatabaseManager::removeBackupItem(std::shared_ptr<BackupItem> item) {
   this->innerRemoveItem(*item);
 }
 
 void DatabaseManager::putLogItem(const LogItem &item) {
   Aws::DynamoDB::Model::PutItemRequest request;
   request.SetTableName(LogItem::tableName);
   request.AddItem(
       LogItem::FIELD_BACKUP_ID,
       Aws::DynamoDB::Model::AttributeValue(item.getBackupID()));
   request.AddItem(
       LogItem::FIELD_LOG_ID,
       Aws::DynamoDB::Model::AttributeValue(item.getLogID()));
   request.AddItem(
       LogItem::FIELD_PERSISTED_IN_BLOB,
       Aws::DynamoDB::Model::AttributeValue(
           std::to_string(item.getPersistedInBlob())));
   request.AddItem(
       LogItem::FIELD_VALUE,
       Aws::DynamoDB::Model::AttributeValue(item.getValue()));
   request.AddItem(
       LogItem::FIELD_ATTACHMENT_HOLDERS,
       Aws::DynamoDB::Model::AttributeValue(item.getAttachmentHolders()));
 
   this->innerPutItem(std::make_shared<LogItem>(item), request);
 }
 
 std::vector<std::shared_ptr<LogItem>>
 DatabaseManager::findLogItemsForBackup(const std::string &backupID) {
   std::vector<std::shared_ptr<database::LogItem>> result;
   std::shared_ptr<LogItem> item = createItemByType<LogItem>();
 
   Aws::DynamoDB::Model::QueryRequest req;
   req.SetTableName(LogItem::tableName);
   req.SetKeyConditionExpression(LogItem::FIELD_BACKUP_ID + " = :valueToMatch");
 
   AttributeValues attributeValues;
   attributeValues.emplace(":valueToMatch", backupID);
 
   req.SetExpressionAttributeValues(attributeValues);
 
   const Aws::DynamoDB::Model::QueryOutcome &outcome =
       getDynamoDBClient()->Query(req);
   if (!outcome.IsSuccess()) {
     throw std::runtime_error(outcome.GetError().GetMessage());
   }
   const Aws::Vector<AttributeValues> &items = outcome.GetResult().GetItems();
   for (auto &item : items) {
     result.push_back(std::make_shared<database::LogItem>(item));
   }
 
   return result;
 }
 
 void DatabaseManager::removeLogItem(std::shared_ptr<LogItem> item) {
   this->innerRemoveItem(*item);
 }
 
 } // namespace database
 } // namespace network
 } // namespace comm