Hello Jacqui,
The version of EV is important to know.
Prior to 8, you have to use registry keys to place ev in read-only mode. With 8, you use powershell.
What we do is the following (using 8.0 powershell scripts)
place mbx ev-server in backup mode.
backup systemstate, msmq folder, tempfolder, shoppingfolder, index-disk and store-disk.
backup sqldatabase that belongs to store + the belonging fingerprintdatabase.
place mbx ev-server in normalmode
the directorydatabase, monitoringdatabase and auditdatabase are being backedup twice a day.
we do not backup ev-data from our journalarchiving servers (calculated risk).
Check the following documents also:
http://seer.entsupport.symantec.com/docs/322715.htm
http://seer.entsupport.symantec.com/docs/320845.htm
http://seer.entsupport.symantec.com/docs/317560.htm
https://www-secure.symantec.com/connect/articles/enterprise-vault-best-practiceev-backups
There should be a pdf out there about Backing up EV8, but I cannot find it at the moment.
Good luck.
Regards. Gertjan