understanding Exchange Recovery storage group.

understanding Exchange Recovery storage group.

Let s say I have 3 storage groups, 1st,2n,3rd SG


If I understand when trying to restore a whole database or  individual mailboxes or  individual messages of the 1 st SG, we should create a recovery storage group for 1st storage group , then:

If I need to restore whole database, I will have to dismount the 1st SG database  and restore the whole database to  the Recovery storage group and from the RSG I can use a tool to restore the DB to 1 SG--- though it sounds like I can restore and overwrite the exting DB without going through the RSG.
Correct?

If I need to restore just one or few mailboxes or one or few messages I don't need to dismount the Database in the 1st SG, but I need to use a tool to export that one mailbox or few mailboxes that need to be restored, or one message or few messages that need to be restored.

correct me where I am wrong please

thanks
jskfanAsked:
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jskfanAuthor Commented:
To be brief ,

in which case do you use RSG ?
In which case you Dismount the DB in regards to the restore from SG?
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Glen KnightCommented:
you use the RSG when you want to recover data from within the database and not the whole database.

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jskfanAuthor Commented:
When using the backup software such as Veritas or comvault, do you need to create the RSG ? because these backup tools have the capabilties of restoring individual mailboxes or even items,



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Glen KnightCommented:
No you do not.
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jskfanAuthor Commented:
you mean RSG is using just when you use EXMERGE tool( which is free tool fro MS)?
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Glen KnightCommented:
correct.
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Glen KnightCommented:
or in new versions of Exchange you use the Exchange Management Shell to recover the mailbox,.
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jskfanAuthor Commented:
so the RSG is to recover a single mailbox, what if I need one or few items only such as mail,calendar,task,journal, etc..
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lucid8Commented:
1.  Regarding your question on Veritas, CommVault etc it really depends upon the product and the type of backup you do, i.e. all usually include a way to do granular recoveries, HOWEVER, in many cases you have to do a "special" backup in order to obtain granular recoveries.  Case in point Symantec which bought Veritas has the ability to do granular recoveries of mailboxes and items but ONLY if you do a (Granular Recovery Technology) GRT based backup and it has other limitations as well.

2. RSGs are used as a way to give many 3rd party backup providers granularity because then they don't have to do a special backup nor a second pass backup, i.e. backing up the databases is the primary level of protection all exchange aware backup agents deliver backups and when it comes to needing additional granularity they have you either do a special/secondary backup or they tell you to use the RSGs.

3. You can use RSGs to do mailbox as well as only specific items you can do filtering etc.  Here is a decent article on RSGs, how to use, filtering etc http://www.petri.co.il/using_rsg_in_exchange_2007.htm

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jskfanAuthor Commented:
Thanks
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lucid8Commented:
Happy to assist and thanks for the points
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