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I would like to update the service pack 3 on the sql server 2005..servers is very critical..Could I create a SnapShot before I run the update?if so,how can I create snapshot? or are there any method as SnapShot? which is the best method to backup the databases before updating? 
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I would like to update the service pack 3 on the sql server 2005..servers is very critical..Could I create a SnapShot before I run the update?if so,how can I create snapshot? or are there any method as SnapShot? which is the best method to backup the databases before updating? 

to backup the databases before sp3

Microsoft SQL Server 2005 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. It includes support for managing XML data and allows a database server to be exposed over web services using Tabular Data Stream (TDS) packets encapsulated within SOAP (protocol) requests.