My understanding is that importing a blockchain backup with Monero and other cryptocurrencies takes about the same time it takes to sync normally. The only reason I could see for someone doing that, then, is if they have a high latency internet connection, or not much bandwidth.
Is that correct reasoning?
Will importing the .raw be quicker than syncing when running through Whonix/Tor? (I would just experiment, but I am having issues running monerod at the moment).