Automate logging into 1Password CLI V2

Like question in https://1password.community/discussion/121784/automate-logging-into-1password-cli, how can I do this in 1Password CLI V2? I tried the command echo "MYPASSWORD" | eval $(op signin) but it doesn't work.

My need is to be able to automate logging into my account so that I can use 1password-cli to backup all data regularly. Is there a better solution to this need?

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