Can I select only a few specific folders to back up with Time Machine? Can I backup only specific folders with Time Machine? 

If there is not an "official" way to do this, does somebody know a trick to do so?
You may exclude items from a Time Machine backup as follows:


Open System Preferences.
Click Time Machine.
After having enabled Time Machine and chosen a backup disk, click Options.
Click + to specify an item that is not to be backed up. The backup disk is included on this list automatically so that it does not back up itself.