pruning blockchain: what i have to do?

[nondormomai]

In Bitcoincore29 > Settings > Main
I read
"Prune block storage to  ______ GB"


I have a question.

If I enter "200" in the blank field, the software...

A) ......leaves only the last (most recent) 200 GB of blocks on my SSD
or
B) .....deletes the oldest 200 GB from the blockchain I downloaded (in this case, the floating point cannot exceed the size of the entire blockchain).


It would make sense for A), but I'm asking.


Thank you

[Cookdata]

Pruning leaves the recent block to the size you set in the prune, as you download new blocks, the old blocks will be deleted to fit into that size of 200gb.

So A is correct.

[nondormomai]

Pruning leaves the recent block to the size you set in the prune, as you download new blocks, the old blocks will be deleted to fit into that size of 200gb.

So A is correct.

Thank you.

But is the pruning possibile only after i have downloaded all blocks?
or i can set the pruning option when i install the client?

[Cookdata]

Pruning leaves the recent block to the size you set in the prune, as you download new blocks, the old blocks will be deleted to fit into that size of 200gb.

So A is correct.

Thank you.

But is the pruning possibile only after i have downloaded all blocks?
or i can set the pruning option when i install the client?

To answer your question, yes you can prune even after downloading the blocks

You can as well set pruning option immediately after installation.

But you should only be pruning if you don't have enough space to keep the whole blocks or you are trying to manage space on your computer.

If you have the space and can keep 600gb plus, there is no reason to prune.