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You can use an existing SQL server to host the database of WSUS. However here are some thigns that you should be aware of:

Benefits:

• A single backup process and tools can take care of all the databases in the SQL server including the WSUS database.
• Patching one SQL server is easier to keep track of than multiple SQL servers on multiple machines.
• You can consolidate your SQL server onto a single beefy machine.

Concerns:

• During Synchronization WSUS generates a heavy load on the SQL server. If the other applications using SQL server are sensitive to SQL server being under heavy load then you can run into problems.
  
  Workaround: You can schedule the WSUS synchronization job for a time that SQL server is under least amount of load.