If you are getting out of space on the drive where you are saving WSUS updates, you can install a new drive and then move the updates to the new location. You can use WSUSUtil.exe with MoveContent command to move the updates to new location.
Eg:
wsusutil movecontent contentpath logfile -skipcopy [/?]
Parameter Definition
contentpath
The new root for content files. The path must exist.
logfile
The path and file name of the log file to create.
-skipcopy
Indicates that only the server configuration should be changed, and that the content files should not be copied.
/help or /?
Displays command-line help for movecontent command.
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