How to save progress of being on a team?

I'm trying to figure out how to save progress from being in the game, then rejoining. You are put into a team once you hit a block, and this team determines you respawning at the checkpoint, which I have already done. The problem is that I want this to save from the next time you join. How would I go about this? Any help would be appreciated.

Extra info: There are five teams "intro" "level 1" "level 2" "level 3" "level 4" and five spawns named the same but with capitalization difference.

(Looking for a general waypoint for me to look at here on how to get this done)