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The process for transferring daily data from AWS S3 to GCP GCS can be completed using the following steps:

1. Create an IAM user in AWS with the necessary permissions to access the S3 bucket.
2. Generate an access key and secret key for the IAM user.
3. Create a service account in GCP with the necessary permissions to access the GCS bucket.
4. Generate a JSON key file for the service account.
5. Install and configure the AWS Command Line Interface (CLI) on the local machine or server where the transfer will be initiated.
6. Configure the AWS CLI with the IAM user access key and secret key.
7. Use the AWS CLI sync command to transfer the daily data from the S3 bucket to a local directory.
8. Install and configure the Google Cloud SDK on the local machine or server where the transfer will be initiated.
9. Use the gsutil rsync command to transfer the data from the local directory to the GCS bucket.
10. Schedule the transfer process to run daily using a cron job or similar tool.

It is important to note that the transfer process may vary depending on the specific requirements and configurations of the data being transferred. It is recommended to review the AWS and GCP documentation and consult with a cloud expert if needed for optimal results.