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As we know DAG data is stored in:

 Mac/Linux: $(HOME)/.ethash/

My blockchain has been running for 2 months, so there is more than one file in the above directory.

Question 1: Can I remove the older versions?

Question 2: If I mistakenly remove the current version, would my blockchain data (e.g. transactions and deployed contract) be deleted?

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Question 1: Can I remove the older versions?

You should keep the two most recent files. It's possible/likely that the most recent file is the future, pre-generated DAG that will be used in the next epoch.

Question 2: If I mistakenly remove the current version, would my blockchain data (e.g. transactions and deployed contract) be deleted?

No - the DAG file is a separate entity used in mining. It just means you'll have to wait for the current DAG file to be regenerated next time you start your client.

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