Back up your current contacts using Contacts > File > Export > Contacts Archive, and then do what I suggested, and you'll have your current contacts ready to import if the forward restore goes bad.

Actually, you can just overwrite the Time Machine restoration by importing your Contacts Archive...no need to do a forward restore.

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire