diff --git a/services/backup/src/Reactors/server/CreateNewBackupReactor.cpp b/services/backup/src/Reactors/server/CreateNewBackupReactor.cpp
--- a/services/backup/src/Reactors/server/CreateNewBackupReactor.cpp
+++ b/services/backup/src/Reactors/server/CreateNewBackupReactor.cpp
@@ -8,9 +8,9 @@
 namespace network {
 namespace reactor {
 
-std::string CreateNewBackupReactor::generateBackupID() {
-  // mock
-  return generateRandomString();
+std::string
+CreateNewBackupReactor::generateBackupID() {
+  return generateUUID();
 }
 
 std::unique_ptr<ServerBidiReactorStatus> CreateNewBackupReactor::handleRequest(
@@ -46,6 +46,12 @@
 
       // TODO confirm - holder may be a backup id
       this->backupID = this->generateBackupID();
+      if (database::DatabaseManager::getInstance().findBackupItem(
+              this->userID, this->backupID) != nullptr) {
+        throw std::runtime_error(
+            "Backup with id [" + this->backupID + "] for user [" +
+            this->userID + "] already exists, creation aborted");
+      }
       response->set_backupid(this->backupID);
       this->holder = this->backupID;
       this->putReactor = std::make_shared<reactor::BlobPutClientReactor>(