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Backing up your virtual service offerings will mean backing up several types of information: user data, corporate data, databases, documents, system state information for your servers, and Active Directory data As mentioned earlier, you can use either WS08 Backup or a thirdparty backup tool to perform these backups Whichever one you use, make sure that you will use a standard backup strategy, creating backup sets of specific data types for example, creating only user data backups in one backup set and only system data in another This will simplify the restoration process Data backups are rather straightforward; select the data drive and back it up Remember that WS08 will automatically create a shadow copy before backing up the data In fact, the backup set is created from shadow copy data This avoids issues with open files Shadow copy also has special APIs that enable it to work with databases such as SQL Server and Exchange Server, making the snapshots valid even for databases Basically, you should backup data and operating systems on a daily basis Perform a full backup once a week and then rely on differentials
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NOTE Windows Server Backup is not compatible with NTBackup, the backup tool from previous
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versions of Windows If you have data stored in an NTBackup and you want to restore it to a WS08 server, then download NTBackup from Microsoft at http://gomicrosoftcom/ fwlink/ LinkId=82917 You need to support your backup strategy with both a remote storage solution and offsite media storage Remember that you will need a third-party backup tool if you want to back up to tape You will need to ensure that you have a safe offline storage space for media You should rotate offsite media on a regular basis For example, every second complete backup should be stored offsite in a controlled environment A common schedule relies on a four-week retention strategy This means that you retain backup media for a period of four weeks If you keep every second copy offsite, then you are always only a week away from complete disaster In addition, your archiving schedule will outline which copies you should keep offsite on a permanent basis
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particular policy, since you already have offsite copies of all of the virtual machines and Windows Server Hyper-V lets you mount VHDs in an offline mode, letting you recover any data file you need from the mounted virtual hard drive
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Select a Third-Party Backup Tool
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One of the most important aspects of the selection of a third-party backup tool is its awareness of the components that make a server operate Many backup tools, especially backup tools that are designed to back up Windows data and store it on central, mainframe servers are dump backup tools; all they do is copy a file from the Windows server to a central location When you choose a backup tool, make sure it is Windows Server aware There are a number of third-party backup solutions on the market that are specifically designed for Windows Server 2008 They all meet specific criteria, which must include: Being aware of system state data Being integrated with the Volume Shadow Copy service, triggering a shadow copy before launching a backup operation Enabling complete system recovery from a simple process Being Active Directory aware Meeting these four basic criteria is essential There are other criteria, of course, such as integrating with massive storage products that are supported by Windows, including special drivers for SQL Server and Exchange, and so on; but the four listed here are the core requirements for an intelligent, third-party backup solution
Authoritative Active Directory Domain Services Restores
One of the most significant issues with WSB and WS08 in general in terms of backup, and especially restoration, is Active Directory Domain Services ADDS is a complex database Often, the best way to restore a downed domain controller is to rebuild the DC to a certain level and then let multimaster replication take over to bring the server up to date The impact of this recovery strategy is that it taxes the network, especially if the DC is a regional server It all depends on the level to which you rebuild the server and the obsolescence of the data it contains Fortunately, WS08 lets you stage DCs with offline media This means that you can create an ADDS database backup on removable media and use it to stage or restore DCs The more recent the media, the less replication is required Recoveries of this type are not too complex These recoveries assume that the data within the other replicas of the directory database is authoritative it is valid data It also means that there was no critical and unreplicated data within the downed DC Issues arise when there is critical data within a downed DC, data that is not within the other replicas, or when an error occurs and data within the directory is damaged and must be restored In this case, you must perform an authoritative restore This is where you begin to find the limitations of WSB Active Directory Domain Services manages directory replication through the update sequence number (USN) USNs can be thought of as change counters and represent the number of modifications on a domain controller since the last replication Values for objects and properties that have the highest USN are replicated to other domain controllers and replace the values that are in the copies of the directory database located on the target DCs USNs are also used to manage replication conflicts If two domain controllers have the same USN, then a timestamp is used to determine the latest change When you perform a normal ADDS restore, data that is restored from backup is updated according to the information in
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