The server is regularly logging "MSExchangeIS Mailbox Store" 7043 events [The mailbox GUID of an external system mailbox ('Mailbox - SystemMailboxXYZ') does not match the information in the Active Directory for the mailbox]. The cause appears to be excess entries in "Microsoft Exchange System Objects" and the recommendation is to delete them. However, if I am wrong or if I delete the wrong thing, I'd like to be able to restore to reverse the deletions.https://social.technet.microsoft.com/Fo ... em-mailboxhttps://social.technet.microsoft.com/Fo ... change2010http://enterpriseit.co/microsoft-exchan ... y-mailbox/
As for "NTDS Quotas" and "TPM Devices", I don't have a specific use case. I just noticed they were missing. However, the general case of an admin having to restore because something was deleted that shouldn't have been probably applies to all 3. Some admins have a habit of getting themselves into trouble. However, I understand your caution. I'm glad that access to those items is available via an XML edit.
So, if you want to test my use case, delete some of your "SystemMailboxXYZ" entries, wait for the Exchange server to start getting upset (reboot it if you wnt to try to accelerate things) and then try to restore them back.