The greediest mode is "archive", today it takes around 80GB There are also "rolling" and "full" nodes, with which you can launch your tezos node thanks to a recent snapshot of the blockchain. For snapshots taken the 14th of September 2020, it weighs between 474Mb (rolling node) and 4,7Gb (full node) and a few minutes to set up.
The maximum size for a block is 512kB, with one block per minute in the Edo protocol.
Since it depends on the activity on the blockchain, there is no fixed value. On the other hand, there is a block created every minute and a block max size is 512kB, the maximum it could increase in a day would be 737,28 MB.
We recommend the following:
Server available 24/7 with stable internet connection
At least 8 GB of RAM
SSD disk (preferably with more than 100 GB storage)
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