When I activate the limit and it is set to 2 GB, it seems that 12 GB will be saved. Not 600. It is true?
If you set the prune limit to 2 GB, you keep 2 GB of data from the blockchain and the UTXO set which should be around 11 GB in size as of now.
But still, I don't understand that I don't have 600 gigs of space, where is the downloaded 600 gigs saved! UPDATE: I realized. The blockchain will be downloaded and removed from the hard drive at the same time, and the amount of 12 gigs will remain.
Almost true. Just note that you keep 2 GB of data from the blocks, not more.