Lately I had to bring back to life an old Windows XP vm, and … tadaaa … tons of downloads from Windows Update.
Well, lots of files to be saved for next sleeping WinXP vm to restore.
This is directory where Windows stores Windows Update file: %WINDIR%\SoftwareDistribution\Download\
source Windows XP: Save Downloaded Windows Update Files For Re-Use
Windows 7 (ATTENTION: not verified!): Update Windows 7 PC Offline By Downloading Windows Updates To Another Computer
This wasy you save bandwidth and, most important, time