Does anyone have some diagrams or simple slides to explain enabling safety copies. I have put down some main points and flow below but seems overly complicated to explain in just words.
The safety copy option if enabled basically allows all archived items to remain present within the target (Exchange.) until a good backup of the vault store partitions have been completed. These copies provide a safety net in the event of a hardware failure of the Vault Store partition(s). EV 11/12 also allows safety copies to me kept on EV's storage queue folder - typically a seperate disk.
Note it requires careful planning and some staging storage space is required on EV/Exchange space/backup monitoring and integration with NBU/Vmware policy to get this to work properly . In the event that a good backup is not done or that EV is unaware that the backup is done the Exchange DB / EV temp storage may blow up (.especially if have enabled safety copies for journaling vault store.) Note the best practice is to enable it if after proper planning, extra storage buffer is catered during backup failures and backup mode and EV backup mode script testing has been done.
Detailed flow of what happens in each of the 3 options/scenarios :-
Scenario 1 : If you chose option 1 "immediately delete" ( i.e. no safety copy and only 1 copy remains - current setting)
Normal email archiving flow (current) :-
Scenario 2 : If you chose option 2 " Yes, in original location" ( i.e. 2 copies maintained with email remaining in exchange until a backup on EV is completed successfully )
Safety copy enabled archiving flow :-
**There is a mechanism to create a create trigger file after each backup job on a partition has run to mark an entire partition as backed up. This is useful for vm snapshot type backups which do not change the archive bit
Scenario 3 : Option 3(new) "Yes, in the storage queue" i.e. 2 copies maintained with email in in Vault Store partition and another kept in Storage Queue folder till a backup is performed on EV. *EV 11/12 partially replaces MSMQ functionality withnew Storage queue feature
Safety copy enabled archiving flow( safety copy kept on the Storage queue) :- , the mailbox archiving process is as follows:-
Enterprise Vault creates empty .EVSQ files and then populates them as required. The files are deleted when they are not longer needed.
There are many specialized storages where this process is being taken care of, like Dell EMC ECS (and its predecessor Centera), Hitachi HCP and others so for a comprehensive explanation those need to be factored in as well.