Backup or storage replication option

I have a server with about 20TB of data connected to Dell EqualLogic enclosure. For the backup/recovery option.  Is it better to get the 2nd similar enclosure and replicate the the primary or have a normal disk-to-disk backup option?  
With storage replication I can just connect to the server in case the primary corrupts and faster to connect then just to recover from the backup?
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Tiras25Asked:
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Aaron TomoskySD-WAN SimplifiedCommented:
I think you answered your own question ;)
If its replicated you can just connecte to it in case of a failure. No real benefit to doing it the other way

A third option is to replate the server as well in the remote location. Now you have full dr
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Tiras25Author Commented:
My concerns are:
1 - the price.  Its most likely be more pricey.
2 - if the data gets corrupted on the primary store, it will be replicated to the 2nd also.  

The server doesn't have internal storage at all. It boots off the LUN volume so it the data store also..
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Aaron TomoskySD-WAN SimplifiedCommented:
The issue I see with backup style is that you actually need more storage for versioning...so it may actually cost more.
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pgm554Commented:
>2 - if the data gets corrupted on the primary store, it will be replicated to the 2nd also.  

That's what CDP snapshots are for..

You got corruption,you roll back the snapshot to a earlier snapshot.

See:

http://eval.symantec.com/mktginfo/enterprise/white_papers/b-techbrief_nbu_snapshots_replction_cdp_WP-20719041.en-us.pdf 
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maytrixCommented:
You really need to consider all the goals that you are looking to achieve.

Is it backups so if a user deletes a file they can recover it a month later?  Is it DR recovery so in the event there is a disaster with the primary SAN you can recover on the backup?  Are they both in the same location?

For backups, I'd look specifically for something that will handle backups.  I wouldn't rely on snapshots and/or replication for typical backups - that's not really what its designed for.  You also need to consider getting the data offsite in the event something happens to your location - I see no mention of a second site.
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madunixCommented:
I would go SAN replication, but before that you need to identify maximum allowable downtime i.e. RPO and RTO, when the maximum allowable downtime is determined, management will be much more inclined to defend the resources required to maintain the recovery facilities and plan as necessary  to enable recovery within the tolerance period.  By knowing the maximum allowable Information systems downtime, organization will either not over invest or under invest in recovery facilities such as hot and cold sites.

The RTOs (Recovery time objectives) are the acceptable time delay in availability of business operations, while RPO's (Reovery point objectives) are determined based on the acceptable data loss in case of disruption of operations. It indicates the earliest point in time to which it is acceptable to recover the data. RPO effectively quantifies permissible amount of data loss in case of interruption.

I did SAN to SAN replication synchronous over Darkfiber distance 5Km with zero lost data between 2 Data Centre's, but the main challenge in SAN replication is to have enough bandwidth such as dark fiber for replication between the Data Centre's. Note that incorrect entries, faults, virus in the system also will be replicated, I would recommend backup tapes on certain frequencies for the Data, so you can move back to the last known good data.
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Aaron TomoskySD-WAN SimplifiedCommented:
I think the confusing part is that we are thinking about this backwards. Instead of looking at the solution: replication vs backup, define the goals first. Then find a solution to meet those goals. Do you need to prevent data loss from accidental deletion? Hardware failure? Building burns down?
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