I use ZCS 7.1 open source version. For backing up emails I use scripts from Backing up and restoring Zimbra (Open Source Version) - Zimbra :: Wiki
Backing up: /opt/zimbra/bin/zmmailbox -z -m account@domain.com getRestURL "//?fmt=zip" > /mnt/zimbra/date/account.zip

All emails are backed up.

However if I want to restore, only delivered emails restores, not Drarfs or Sent item. Can you please help me what to do to restore all the emails (both delivered emails and sent items...)
For restoring I use: /opt/zimbra/bin/zmmailbox -z -m account@domain.com postRestL "//?fmt=zip&resolve=reset" /mnt/zimbra/date/account.zip

Thank you