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Does Mint 18 have a feature (similar to Win) to revert to and restore a previous configuration of settings (other than going all the way back to default settings and wiping out all changes that may have been made? Thank you.

backup solutions exist.
there's so many different options, you have to search for a while and see what floats your boat.
it starts with a simple app (e.g. rsync) and ends with filesystems that have this feature built in (btrfs).

Restore cinnamon.css from backup?