How does Chia mining work 
If I start Chia mining, lets say with 4x10TB =40TB
It will take some time :), but will hoppfully mine some value.
When 40TB is reached, mining stops, forever until I add more storage?
And if one drive fails, in this case, one 10TB drive, I have to replace that storage to sync back the lost 10TB?
and then start mine again if I have some more free storage?
If that’s the case, why not wipe the drives and create a new account when drives are full?
And start again?
Nope, not correct.
In the beginning, you create plots (files) to fill the drive space. Then you farm/harvest those files. You can farm those files forever. Never creating any new ones. If one of the drives fail, you will just replace it and then fill it with new plots. But the more plots you have, the more you make. So, you decide what your commitment is to the venture.
Thanks for the reply!
But just one more dumb question 
Then if my 10TB drive fails, I can replace it and fill it with new plots, But over time, say 2-5 years is the drives current plot worth more than if I create new one?
Lets say it’s go 3 years and drives fail, option 1 replace drive, option 2 (not likley) restore from backup
I don’t know If you understand my question, English is not my first language. 
A plot is a plot. It is a waste of resources to backup chia plots. Just create new ones if you need to.
You are better off using that backup storage for more plots! 
Thanks! just wanted to know if an “old” plot is worth more that a “new” one 
Then is 40TB something to start with today, or is that just to small/to late… to make any money.
When you farm 40TB solo, then the expected time to win is very long.
If you join a pool, then rewards are smoothed out, the issue is that Chia is still developing the official pooling protocol and only un-official pools are available with their own issues / concerns.
If you already have the 40 TB laying around not doing anything, then maybe. The main expense is going to be your plotting, which can use up SSD.
I would say that with that amount of space there is not much point in plotting now before the pool protocol is officially out, just because you would have to replot it anyway (adding to the cost of used up SSD) and you are very unlikely to have a win in that amount of time.
At the current price of chia with 40 terabytes you would make somewhere around $2 a day once pools are out probably less though because by then that space will have increas
Ok, Thanks for the answer, I don’t have 40TB rigth now more like 20TB, so buying more is just a waste of money right now 
:disappointed , but can’t one Chia get worth 1 million dollar 2030? 
If we only knew the future, I’d have so many bitcoin right now
Todays hard disk prices are inflated, because of the hype around Chia.
In addition you will be competing with people who already had hard disk space lying around.
It’s a decision you’ll have to make on your own, taking into account what you think the future will bring for Chia… Return on Investment (how long it takes to farm and make your investment back)
and for a lot of us, it’s also a hobby… putting together plotting rigs and optimizing it all.
Thanks for you all that have taken time to answer to a new beginer to Chia!
Just one more question
Today, where is breakpoint to make new Chia or just better to speculate in the value?
Just like Bitcoin, you can’t make that in the bedroom any longer, To expensive,
but Chia? 
Happy Chia!
I am farming only right now on about 20TB. I have roughly 1+ year give or take up to 4x to start winning. That is to say, if the Chia app is correct. Chiacalculator.com says 10 or 11 months (fluctuates). I do a 2x from Chiacalculator as I don’t trust their estimate. I could hope to win this time in 2023 or 2024 if I do nothing to try and tip the odds in my favor.
If you need to buy more storage to get above let’s say 20TB+, then my opinion on the matter could have changed over time. Forget about it and just buy a few XCH and wait on the rebound.