diff --git a/services/backup/src/DatabaseEntities/BackupItem.h b/services/backup/src/DatabaseEntities/BackupItem.h
--- a/services/backup/src/DatabaseEntities/BackupItem.h
+++ b/services/backup/src/DatabaseEntities/BackupItem.h
@@ -3,7 +3,6 @@
 #include "Item.h"
 
 #include <string>
-#include <vector>
 
 namespace comm {
 namespace network {
@@ -37,7 +36,7 @@
   uint64_t created;
   std::string recoveryData;
   std::string compactionHolder;
-  std::vector<std::string> attachmentHolders;
+  std::string attachmentHolders;
 
   void validate() const override;
 
@@ -58,7 +57,7 @@
       uint64_t created,
       std::string recoveryData,
       std::string compactionHolder,
-      std::vector<std::string> attachmentHolders);
+      std::string attachmentHolders);
   BackupItem(const AttributeValues &itemFromDB);
 
   void assignItemFromDatabase(const AttributeValues &itemFromDB) override;
@@ -72,7 +71,9 @@
   uint64_t getCreated() const;
   std::string getRecoveryData() const;
   std::string getCompactionHolder() const;
-  std::vector<std::string> getAttachmentHolders() const;
+  std::string getAttachmentHolders() const;
+
+  void appendAttachmentHolder(const std::string &attachmentHolder);
 };
 
 } // namespace database
diff --git a/services/backup/src/DatabaseEntities/BackupItem.cpp b/services/backup/src/DatabaseEntities/BackupItem.cpp
--- a/services/backup/src/DatabaseEntities/BackupItem.cpp
+++ b/services/backup/src/DatabaseEntities/BackupItem.cpp
@@ -1,6 +1,7 @@
 #include "BackupItem.h"
 
 #include "Constants.h"
+#include "GlobalConstants.h"
 
 namespace comm {
 namespace network {
@@ -21,7 +22,7 @@
     uint64_t created,
     std::string recoveryData,
     std::string compactionHolder,
-    std::vector<std::string> attachmentHolders)
+    std::string attachmentHolders)
     : userID(userID),
       backupID(backupID),
       created(created),
@@ -65,7 +66,7 @@
     auto attachmentsHolders =
         itemFromDB.find(BackupItem::FIELD_ATTACHMENT_HOLDERS);
     if (attachmentsHolders != itemFromDB.end()) {
-      this->attachmentHolders = attachmentsHolders->second.GetSS();
+      this->attachmentHolders = attachmentsHolders->second.GetS();
     }
   } catch (std::logic_error &e) {
     throw std::runtime_error(
@@ -107,10 +108,15 @@
   return this->compactionHolder;
 }
 
-std::vector<std::string> BackupItem::getAttachmentHolders() const {
+std::string BackupItem::getAttachmentHolders() const {
   return this->attachmentHolders;
 }
 
+void BackupItem::appendAttachmentHolder(const std::string &attachmentHolder) {
+  this->attachmentHolders += attachmentHolder;
+  this->attachmentHolders += ATTACHMENT_DELIMITER;
+}
+
 } // namespace database
 } // namespace network
 } // namespace comm
diff --git a/services/backup/src/DatabaseEntities/LogItem.h b/services/backup/src/DatabaseEntities/LogItem.h
--- a/services/backup/src/DatabaseEntities/LogItem.h
+++ b/services/backup/src/DatabaseEntities/LogItem.h
@@ -3,7 +3,6 @@
 #include "Item.h"
 
 #include <string>
-#include <vector>
 
 namespace comm {
 namespace network {
@@ -23,7 +22,7 @@
   std::string logID;
   bool persistedInBlob;
   std::string value;
-  std::vector<std::string> attachmentHolders;
+  std::string attachmentHolders;
 
   void validate() const override;
 
@@ -42,7 +41,7 @@
       const std::string logID,
       const bool persistedInBlob,
       const std::string value,
-      std::vector<std::string> attachmentHolders);
+      std::string attachmentHolders);
   LogItem(const AttributeValues &itemFromDB);
 
   void assignItemFromDatabase(const AttributeValues &itemFromDB) override;
@@ -55,7 +54,9 @@
   std::string getLogID() const;
   bool getPersistedInBlob() const;
   std::string getValue() const;
-  std::vector<std::string> getAttachmentHolders() const;
+  std::string getAttachmentHolders() const;
+
+  void appendAttachmentHolder(const std::string &attachmentHolder);
 };
 
 } // namespace database
diff --git a/services/backup/src/DatabaseEntities/LogItem.cpp b/services/backup/src/DatabaseEntities/LogItem.cpp
--- a/services/backup/src/DatabaseEntities/LogItem.cpp
+++ b/services/backup/src/DatabaseEntities/LogItem.cpp
@@ -1,6 +1,7 @@
 #include "LogItem.h"
 
 #include "Constants.h"
+#include "GlobalConstants.h"
 
 #include <stdexcept>
 
@@ -21,7 +22,7 @@
     const std::string logID,
     const bool persistedInBlob,
     const std::string value,
-    std::vector<std::string> attachmentHolders)
+    std::string attachmentHolders)
     : backupID(backupID),
       logID(logID),
       persistedInBlob(persistedInBlob),
@@ -63,7 +64,7 @@
     auto attachmentsHolders =
         itemFromDB.find(LogItem::FIELD_ATTACHMENT_HOLDERS);
     if (attachmentsHolders != itemFromDB.end()) {
-      this->attachmentHolders = attachmentsHolders->second.GetSS();
+      this->attachmentHolders = attachmentsHolders->second.GetS();
     }
   } catch (std::logic_error &e) {
     throw std::runtime_error(
@@ -100,10 +101,15 @@
   return this->value;
 }
 
-std::vector<std::string> LogItem::getAttachmentHolders() const {
+std::string LogItem::getAttachmentHolders() const {
   return this->attachmentHolders;
 }
 
+void LogItem::appendAttachmentHolder(const std::string &attachmentHolder) {
+  this->attachmentHolders += attachmentHolder;
+  this->attachmentHolders += ATTACHMENT_DELIMITER;
+}
+
 } // namespace database
 } // namespace network
 } // namespace comm