The difference between checkpoint/restore and restarting

The restart command resets the simulator to time zero, clears out any logged waveforms, and closes any files opened under VHDL and the Verilog $fopen system task. You can get the same effect by first doing a checkpoint at time zero and later doing a restore. But with restart you don't have to save the checkpoint and the restart is likely to be faster. But when you need to set the state to anything other than time zero, you will need to use checkpoint/restore.

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