Originally posted by: CDYD_Victor_Miller

I have a number of large MIP's that I'd like to solve, which may take many days (or longer).  How do I take checkpoints so that I may restart the solving process if there is a computer crash?  I know that I could, for example, set a time limit (say 15 minutes), and then save, but how do I save the node tree, and the internal information used, for example, to calculated psedo-costs, etc.?

There is no way to save a snapshot of the tree or any of the information stored in it. The best you can do is save the feasible solutions found during the search and feed them to the next solve as a MIP start.