Restoring Exchange databases from differential backup

I'm currently trying to setup a remote site to mirror the current site infrastructure and reached a hurdle and to get some pointers and guidance.

At present at the current site I have tape backup performed on a nightly basis using Symantec Backup Exec 12.5. In order for me to capture what has occured on that day and transmit it across WAN links, Im performing a backup to disk 30 min prior to the tape backup.

The backup to disk performs a differential backup and the tape performs a full backup. With respect to the backup process this seems to work fine, now my hurdles....

On the remote site I pretty much catalogue the backup files so Backup Exec is aware of whats there, I assume the restore should be pretty swift possibly requiring a reboot.

My question is if say for example MONDAY differential backup does not transmit across the WAN link due to corruption, link failure, etc. The next day TUESDAY differential backup gets transferred across successfully, if I restore this one

(1) will this cause a problem with Exchange?
(2) will there be a gap in emails for that day that did not transfer successfully?

Before any permissions of mailbox server issues come up, the remote site is an EXACT mirror of the current site, same AD, same SID, etc. The sites are connected but are not allowed to communicate with each other for the purpose of corrupting the AD.

With respect to hardware and software I have a Dell 2900, Windows Server 2003 R2 Std SP2 x86, Exchange 2003 Std SP2, Backup Exec 12.5 with Exchange Agent, this is for both sites.

Can you the professionals help?
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dphantomConnect With a Mentor Commented:
The Tuesday differential will incoude all changes since the last full backup.  So missing a differential willnot hurt.  This is true for any backup.  As for Exchange specifically, assuming you are correctly restoring your information store, I think you should be fine if a daily differential is missed/lost whatever and you go to the next differential.
With respect to the differential backups:
All data since the last full backup is backed up with differntials thus the monday set isn't needed since we also took a full backup monday. To fully restore you'll need the differential backup and the previous full backup.

The only thing I can think of as being a problem is having the mirror server pre-built but offline/off network. The secure channel may be broken if/when you bring the "hot spare" online. This would appear as a permissions issue on the server which would lock out the servers machine account.
pccorrectAuthor Commented:
Thanks for the simple answer I needed.
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