diff --git a/services/backup/docker-server/contents/server/dev/DatabaseSimulator.h b/services/backup/docker-server/contents/server/dev/DatabaseSimulator.h
new file mode 100644
--- /dev/null
+++ b/services/backup/docker-server/contents/server/dev/DatabaseSimulator.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "DatabaseEntitiesTools.h"
+
+#include <folly/concurrency/ConcurrentHashMap.h>
+
+#include <functional>
+#include <map>
+#include <memory>
+#include <string>
+
+namespace comm {
+namespace network {
+namespace database {
+
+// thread-safe in-memory database
+struct DatabaseSimulator {
+  // userID -> map(created -> item)
+  folly::ConcurrentHashMap<
+      std::string,
+      std::unique_ptr<std::map<uint64_t, BackupItem>>>
+      backup;
+  // logID -> item
+  folly::ConcurrentHashMap<std::string, std::shared_ptr<LogItem>> log;
+};
+
+} // namespace database
+} // namespace network
+} // namespace comm
diff --git a/services/backup/docker-server/contents/server/src/DatabaseManager.dev.cpp b/services/backup/docker-server/contents/server/src/DatabaseManager.dev.cpp
new file mode 100644
--- /dev/null
+++ b/services/backup/docker-server/contents/server/src/DatabaseManager.dev.cpp
@@ -0,0 +1,84 @@
+#include "DatabaseManager.h"
+#include "Tools.h"
+
+#include <iostream>
+#include <string>
+
+namespace comm {
+namespace network {
+namespace database {
+
+DatabaseManager &DatabaseManager::getInstance() {
+  static DatabaseManager instance;
+  return instance;
+}
+
+void DatabaseManager::putBackupItem(const BackupItem &item) {
+  std::shared_ptr<BackupItem> backupItem = std::make_shared<BackupItem>(
+      item.getUserID(),
+      item.getBackupID(),
+      item.getCreated(),
+      item.getRecoveryData(),
+      item.getCompactionHolder(),
+      item.getAttachmentHolders());
+  if (this->dbSimulator.backup.find(item.getUserID()) ==
+      this->dbSimulator.backup.end()) {
+    this->dbSimulator.backup.insert(
+        item.getUserID(), std::make_unique<std::map<uint64_t, BackupItem>>());
+  }
+  this->dbSimulator.backup.find(item.getUserID())
+      ->second->insert({backupItem->getCreated(), *backupItem});
+}
+
+std::shared_ptr<BackupItem>
+DatabaseManager::findLastBackupItem(const std::string &userID) {
+  if (this->dbSimulator.backup.find(userID) == this->dbSimulator.backup.end()) {
+    return nullptr;
+  }
+  if (this->dbSimulator.backup.find(userID)->second->empty()) {
+    return nullptr;
+  }
+  return std::make_shared<BackupItem>(
+      (--this->dbSimulator.backup.find(userID)->second->end())->second);
+}
+
+void DatabaseManager::removeBackupItem(std::shared_ptr<BackupItem> item) {
+  if (this->dbSimulator.backup.find(item->getUserID()) ==
+      this->dbSimulator.backup.end()) {
+    return;
+  }
+  this->dbSimulator.backup.find(item->getUserID())
+      ->second->erase(item->getCreated());
+}
+
+void DatabaseManager::putLogItem(const LogItem &item) {
+  this->dbSimulator.log.insert(
+      item.getLogID(),
+      std::make_shared<LogItem>(
+          item.getBackupID(),
+          item.getLogID(),
+          item.getPersistedInBlob(),
+          item.getValue(),
+          item.getAttachmentHolders()));
+}
+
+std::vector<std::shared_ptr<LogItem>>
+DatabaseManager::findLogItemsForBackup(const std::string &backupID) {
+  std::vector<std::shared_ptr<LogItem>> result;
+  for (auto it = this->dbSimulator.log.begin();
+       it != this->dbSimulator.log.end();
+       ++it) {
+    if (it->second->getBackupID() == backupID) {
+      result.push_back(it->second);
+    }
+  }
+  return result;
+}
+
+void DatabaseManager::removeLogItem(std::shared_ptr<LogItem> item) {
+  this->dbSimulator.log.erase(item->getLogID());
+}
+
+} // namespace database
+} // namespace network
+} // namespace comm
diff --git a/services/backup/docker-server/contents/server/test/DatabaseManagerTest.cpp b/services/backup/docker-server/contents/server/test/DatabaseManagerTest.cpp
--- a/services/backup/docker-server/contents/server/test/DatabaseManagerTest.cpp
+++ b/services/backup/docker-server/contents/server/test/DatabaseManagerTest.cpp
@@ -28,13 +28,13 @@
 
 BackupItem
 generateBackupItem(const std::string &userID, const std::string &backupID) {
-  return BackupItem(
-      userID,
-      backupID,
-      comm::network::getCurrentTimestamp(),
-      "xxx",
-      "xxx",
-      {""});
+  // this simulates operations that are going to occur one after another on the
+  // timeline. For the dev mode this was failing when reading the current time
+  // because operations on collections were fast and occuring at the same
+  // exact millisecond. In practice, this should never happen(grpc connection
+  // should cause the delay)
+  static uint64_t operationID = comm::network::getCurrentTimestamp();
+  return BackupItem(userID, backupID, operationID++, "xxx", "xxx", {""});
 }
 
 LogItem generateLogItem(const std::string &backupID, const std::string &logID) {
@@ -86,7 +86,9 @@
   EXPECT_EQ(items2.size(), 2);
 
   for (size_t i = 0; i < items1.size(); ++i) {
-    EXPECT_EQ(logIDs1.at(i), items1.at(i)->getLogID());
+    EXPECT_NE(
+        std::find(logIDs1.begin(), logIDs1.end(), items1.at(i)->getLogID()),
+        logIDs1.end());
     DatabaseManager::getInstance().removeLogItem(items1.at(i));
   }
   EXPECT_EQ(
@@ -94,7 +96,9 @@
       0);
 
   for (size_t i = 0; i < items2.size(); ++i) {
-    EXPECT_EQ(logIDs2.at(i), items2.at(i)->getLogID());
+    EXPECT_NE(
+        std::find(logIDs2.begin(), logIDs2.end(), items2.at(i)->getLogID()),
+        logIDs2.end());
     DatabaseManager::getInstance().removeLogItem(items2.at(i));
   }
   EXPECT_EQ(