Ethereum blockchain

Downloading the chaidata files with geth

I downloaded the ethereum  blockchain yesterday  (geth --rpc --fast -- cache=1024) I did not mine at all, today it is different, clearly if I run it again will it append the new data to update the blockchain in my computer or does it start from scratch. Or will the mining software update it?

It downloaded 12.8 GB and now it is growing again.... in 30 minutes it has appended data now it is 13.5 GB in size. Something is not right

If the power goes down do I have to download the whole blockchain again?

Once this is solved I want to mine with cpp-ethereum-windows-v1.2.9.exe

Any suggestions will be appreciated. Running in Winows 8.1

Any ideas?
robrodpProgrammerAsked:
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Dr. KlahnPrincipal Software EngineerCommented:
The Ethereum data directory size was headed for 400 GB back in November, so it still has some more downloading to do.  What you have so far is the initial download, not the complete chain.  If you want to mine you will need the complete chain.  Judging by the size of the blockchain and the exponential shape of the use curve, I'd say it would be prudent to buy a 2TB or 3TB drive for keeping the blockchain on, and reserve that drive for that purpose only.

Ethereum data size
https://dev.to/5chdn/the-ethereum-blockchain-size-will-not-exceed-1tb-anytime-soon-58a

"So, what's the minimum Size of a full-verified Node?

Some 10's of GB by just running parity --no-warp. Earlier this fall it was less than 20 GB, but the state is growing very fast."
Shaun VermaakTechnical SpecialistCommented:
Why not mine on a pool? Then you do not need to download an maintain the blockchain locally

MinerGate is one of these
https://minergate.com

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robrodpProgrammerAuthor Commented:
That is the way to go. Doing it as I comment
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