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Sleep and hibernation: frequently asked questions
There is no need for the hibernation file if you don't intend to use hibernation. You turn it off using the command WHS gave you, from a command prompt. There are no cons.
You should be able to put your browser's cache to another drive. That might save a GB on the SSD.
You can reduce the amount of space devoted to System Restore by using the System Restore interface control slider after you install Windows. If you are daring, you can turn off System Restore entirely. It normally takes up at least several GB.