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Providing Exchange 2003 Disaster Recovery Environment - best way

Running Exchange 2003 Sp2 on 2003 Server, for buisness continuity lookign to provide a DR solution to cover hardware or site failure. Core of buisness uses Change in a 2003 AD network. It is intended to have a remote ADSL link with a 2003 AD, DC and a server with  Exchange 2003 running. In case of failure of the main site, after switching URL etc, email access stull be available.Current Exchange runs in stand alone and lookig for easiest way to provide this spolution. Is it possible to provide some sort of resileince of the Exchange DB using current configuration. The Exchange DB in 20GB insize so prettty large in size.

Looking for a long term solution. Easy to have AD being updated over the remote site, using "slow link" setting in the AD but the smoothiest and easiest way to recover the Exchange in needed.
Hope this makes sense ?
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We have started to roll out Acronis recovery for Exchange, in our testes this has been the quickest way to recovery following a failure, without going to a clustering solution.
The process we used prior to this was to have the second server sitting as a live DC at the remote site. Exchange backups are made to the server nightly. In the event of a failure exchange is installed and the database restored. While not as instant as changing dns records, it was a cheaper failover than clustering.
ccfcfcAuthor Commented:
So is clustering the only way to provide resilience for Exchange ?

What is Acronis then ? I guess I need to havea read up on this product
I have only ever seen it work with clustering.
We have 31 sites working with this solution now. 2 brought up today. the backup goes to a NAS at the remote site. a machine is at site waiting as a DR DC. To activate the fail over we change dns, install and restore exchange.
Acronis recovery for exchange is another product in what i believe to be a great line up.
Fast solution with the flexibility to recover at a detailed level
Disaster Recovery plan auto-generation
Near continuous data protection (CDP) by backing up transaction
Granular restore from database level
Active Restore" provides access to Exchange services and users quickly after a failure
Acronis® Recovery" for Microsoft Exchange is the fastest backup and restore purpose-built solution on the market. It provides granular restore from the database level allowing for recovery of information stores, individual storage groups, mailboxes or specific emails.

You get the best of both worlds: A very fast solution with the flexibility to recover at a very detailed level. Combined with Near Continuous Data Protection (CDP), Acronis® Recovery" for Microsoft Exchange can restore to the point just prior to failure.

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