Enterprise Vault is left in backup mode for some/random indexes after a backup has taken place. Event ID: 7264 & 7318 are logged in the Enterprise Vault Event Log.
A Dtrace of IndexBroker shows the following.
31224234 17:13:21.110  (IndexBroker) <8212> EV:L
CCache::SetIndexLocationBackupMode Notified IndexServer process - Index:
[Off] (hr = Success (0))
31224256 17:13:23.110  (IndexBroker) <8212> EV~E Event
ID: 7264 Abnormal error occurred | |Error: Exception occurred.
(0x80020009) |Reference: CCache::SetIndexLocationBackupMode |Index:
|Info: EM/e | | |
31224277 17:13:25.110  (IndexBroker) <8212> EV~I Event
ID: 7318 Enabling additions, deletions, and updates because the index location
is no longer in backup mode. |Index Location: \\Server\F$\EVStorage\Indexes\index5 |Status: Unspecified error (0x80004005) |
This issue has been addressed as part of the following release:
Enterprise Vault 9.0.3 - Release Details
Enterprise Vault 9 SP2 and Backup Exec R3 Enterprise Vault Agent