Through the use of the EMS the exact time of the last backup of the Exchange backups can be viewed.

View last Full / Incremental / Differential / Copy backup of all Exchange databases in an Organisation

From EMS:

[PS] C:\\>get-mailboxdatabase -Status |fl Name,Server,*backup*,Mounted

Name                           : MailboxDB
Server                         : EX1
BackupInProgress               : False
SnapshotLastFullBackup         : False
SnapshotLastIncrementalBackup  :
SnapshotLastDifferentialBackup :
SnapshotLastCopyBackup         :
LastFullBackup                 : 28/01/2010 21:00:07
LastIncrementalBackup          :
LastDifferentialBackup         :
LastCopyBackup                 :
RetainDeletedItemsUntilBackup  : False
Mounted                        : True

Name                           : SpamQandCatchAll
Server                         : EX1
BackupInProgress               : False
SnapshotLastFullBackup         : False
SnapshotLastIncrementalBackup  :
SnapshotLastDifferentialBackup :
SnapshotLastCopyBackup         :
LastFullBackup                 : 29/01/2010 04:00:10
LastIncrementalBackup          :
LastDifferentialBackup         :
LastCopyBackup                 :
RetainDeletedItemsUntilBackup  : False
Mounted                        : True

Name                           : MailboxDB
Server                         : EX2
BackupInProgress               : False
SnapshotLastFullBackup         : False
SnapshotLastIncrementalBackup  :
SnapshotLastDifferentialBackup :
SnapshotLastCopyBackup         :
LastFullBackup                 : 28/01/2010 21:00:23
LastIncrementalBackup          :
LastDifferentialBackup         :
LastCopyBackup                 :
RetainDeletedItemsUntilBackup  : False
Mounted                        : True

Category:Exchange