How to resume bitcored download block

want to setup bitcore in my system, basic installation all done like below

node -v : v4.8.4 npm -v : 2.15.11 nvm -v : 0.33.4

and i follow the step given in link, everything is working fine till 74 GB, but suddenly power gone, when i restart pc and start process using


execute command it’ll start process from 36GB, i don’t know why it’ll start from 36.

any one have idea to resume process from last stop block, any command or any step are there.