Long story short: backup everything (since it's a backup, and hopefully you won't need it), then use the [whatever].cpt file. You don't want to do work twice, do you? If you use the [whatever]_prev.cpi file, you will calculate some frames *again* that are already there. If you use an up-to-date version of Gromacs (4.5.5 is the most recent one), then the files will be continued and not overwritten. This is stated on the page you already found (hint: "remaining output will be appended to the existing files (energy, trajectory, log, etc).")

Good luck,
Matthias

Am 13.08.2012 21:07, schrieb Juliette N.:
Hello all,

I am going to restart my crashed simulations, but I am not sure which
of  *_prev.cpt or *.cpt to use as they contain different written
frames.

  *_prev.cpt >>>> Last frame         -1 time 7462.900

  *.cpt           >>>> Last frame         -1 time 7468.965

Also on the gmx site it is stated that :

Before doing anything, back up your files! Then use

mdrun -s topol.tpr -cpi state.cpt


What files do I need to back up? the edr. trr .. files that were
written before crash? Is the new run going to overwrite the old files?


Thanks,

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