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Caveats of Protecting Your SharePoint Environment with Microsoft Data Protection Manager

* This article was written in the context of System Center Data Protection Manager 2006 (SCDPM), a technology now considered deprecated with the introduction of System Center Data Protection Manager 2007. Variations may exist. *
Caveats of Protecting Your SharePoint Environment with Microsoft Data Protection Manager 
There are certain caveats that exist when using Microsoft Data Protection Manager within your SharePoint environment that have to be taken into consideration when planning your deployment and disaster recovery strategy. These caveats are very important when considering the impact that they might have on your enterprise environment and disaster recovery.
The Largest Caveat
The largest caveat that exists with a marriage of DPM and SharePoint is support for SQL backups (minus using the backup feature to export and flat file exportation) is not currently supported. This feature is planned to be built in the second half of 2007. 
Hardware Requirements for Microsoft Data Protection Manager
Firstly, you have to look at the actual server itself that you are using as your DPM environment. Running DPM requires using Windows Server 2003 with at the very least SP1 applied, and because you will require two volumes for DPM to function correctly you will need to have two different hardrives.  If you attempt to install DPM on a server with only one harddrive, you will get an exception thrown during the setup dialog. You can optionally add this volume at a later date. The reason that there are two harddrives required is the first will be the OS and relevant DPM program files, and the second will be used for data backups, and nothing else. Putting other program files on the second harddrive could possibly cause the DPM server to crash. Make sure that you also meet over the hardware requirements as well. Allocate at least:
  1. A 2 GHz or faster processor
  2. 2 GB of RAM
  3. 3 times the harddrive space as the estimated protected data
These are over the Microsoft recommendations, however when backing up SharePoint farms it can be a rather resource intensive process and therefore is better to plan over estimations that are more tailored to environments where DPM is mainly used as a file share backup mechanism. As well, SharePoint typically will increase the amount of data stored within its repositories dramatically from initial implementation to full production use by organizational virtual teams, and will only get larger as time progresses and more users adopt to using it. Multiplying your estimates by three is a guess, and the amount of disk space that you use should be on a company by company basis. 
Constantly Changing Data In Exported Backup Files
Remember that similar to SharePoint, Data Protection Manager will keep different revisions of its backups. Content housed within SharePoint is changed extremely frequently, since initial document creation can be housed there through an arbitrary amount of changes with an arbitrary amount parties involved. This can be from a single to a triple digit number depending on the nature of the documentation or object. One must plan accordingly with this in mind. Although DPM will only keep revision of the changes, it still can be a large amount when considering the environment we are tailoring DPM for is SharePoint. 
Ensuring Server Compliance Requirements for Data Protection Manager
Secondly, you have to look at the servers that you have available to assimilate into your DPM environment. Within a SharePoint environment, it is fairly atypical to have any other servers other than Windows Server 2003 running, however with some networks there are often other versions of servers such as Windows Server 2000. If you are using a Windows 2000 machine for your data storage, you should firstly install Service Pack 4. If you have other breeds of servers within your environment such as Unix and Linux, these servers are obviously not supported as data stored for DPM as well, as well, you can’t deploy agents to these servers since they won’t be compatible with the executables.
For Fresh Windows Server 2003 Installations 
Once you have Windows 2003 installed, it will bring up an .hta file which will allow you to configure server roles. Role implementation can also be launched by selecting the manage server roles selection out of the program files menu, or can be manually configured using the add/remove program dialog. You can configure the server with any role you choose besides a domain controller. Since the server will be querying other servers within the environment for disk-to-disk backups, it must be a member of the domain that your SharePoint server and SQL cluster reside on. It is not wise to put other software on this server as well, try to keep it as built down as possible so as not to interfere with other DPM processes.
Say No to Encryption with DPM
With SharePoint, the files that we are mostly concerned with protecting will be the exported SQL backup files and SharePoint file stores. There are some file types that are impossible for DPM to backup however, most notably those that are already encrypted, such as documents encrypted with PGP or other relevant encryption engines. When doing system restores of your SharePoint servers, there are other assets that will not stored within the backup, such as:
  • Paging Files
  • The Recycle Bin
  • Volume Information Folder
With SharePoint, there is typically not an end-to-end encryption solution in place because storing encrypted document within SharePoint repositories will confuse the gatherer and searching since it can’t correctly flag the data within the document. An end-to-end encryption solution for SharePoint that carries the encryption cipher is a piece of software currently being developed at ARB Security Solutions.
With the default package of DPM, there are the possibilities of using three different agents, for three different servers, purchasing more agents is relatively inexpensive if you need to protect more assets within your environment.

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