As for repopulation? I don't know. I think they must have something to do with civilian ships that they orbited around the planet that they have wave motion engines, capable of making lightspeed warp if they been escorted by military and for the colonies they been rescued or they granted for safe havens. As for ginga? That ship have females humans officer, right? Then they must have some crew quarter with luxury, is that correct?
Similar to mission in the first cylon wars that they were gathering the fleet of ships that they thought they were dead. And launch the attack on the enemies command to decapitated and destabilise the enemies rank and file on the order by the decision of the commander. Adapt or die.
In order for retaliation? They must have a plan similar to izumo plan but i think they'll search and rescue for survivors as well as salvage any ship for a fight and repopulate like saki says something bravest and most fear