This is obviously the flip side to this thread about the ability of present-day humans to survive millions of years ago. Let me set some conditions.
The Earth is doomed. Let’s say the sun is going nova–admittedly in defiance of all reasonable astronomical theory, but what the hell. You know this with utter certainty.
No one has a hyperdrive, generation ships, or terraforming technology, so moving to another planet isn’t an option; but your brilliant Uncle Jordan Ellison has invented a time-machine capable of moving a small colony back in time up to 100,000 years. The time machine can be used only once, as its power-source is the nova that’s causing the problem in the first place. You can only go backwards (not that there’s a reason to go forward). Also, the time machine works like a transporter, not a shuttlecraft; it sends its cargo/passengers back in time, but itself remains in the present, so it will not be available for cannabilization afterwards.
Even with the nova as a power source, the time machine’s power is limited. Because time travel is difficult for animals to survive, much of its power has to be used to stabilize them during the trip; it can send a maximum of 120,000 kilograms of living animal matter on this journey. (That’s 2000 people, if they mass an average of 60 kilos each). Plant matter is easier, as are inorganic items. Without the necessity of maintaining metabolic stability during transport, the primary constraint is VOLUME, not mass; the time machine can send a maximum of 80,000 cubic meters of such material back with you. Also, with the assistance of your cousin Monty Scott, you hinky with the machine so that each person sent back can carry the clothes on their back and one backpack with them; the fully-loaded backpack can mass no more than 20 kilograms.
You get to interview prospective colonists, and yours is the ultimate word on who gets a ticket.
Where would you go? When would you go? What would you take? Who would you take? What would your strategy be?