Scheduled process to copy files out of S3 into a temp-folder in Ubuntu 18.04 - bash

Question

Looking for recommendations for the following scenario:
In an ubuntu 18.04 server, every 1 minute check for new files in an AWS S3 bucket, fetch only the newest file to a temp folder at the end of the day remove them.
It should be automated in bash.
I proposed using aws s3 events notification, queues, lambda but it was defined that is best to keep it simple.
i am looking for recommendations for the steps described below:
For step 1 i was doing aws s3 ls | awk (FUNCTION to filter files updated within the last minute)
then i realized that it was best to do it with grep
0-Cron job should run from 7:00 to 23:00 every minute
1-List the files updated to S3 bucket during the past 1 minute
2-List the files in a temp-encrypted folder in ubuntu 18.03
3-Are the files listed in step 1 already downloaded in folder temp-encrypted from step 2
4-If the files are not already donloaded > download newest files from S3 bucket into temp-encrypted
5-At end of the day 23:00 take a record of the last files fetched from s3
6-run cleanup script at end of the day to remove everything in temp-encrypted
I attach a diagram with the intended process and infrastructure design.

Answer 1

The solution was like this:
Change FTPS to SFTP running in Ubuntu 18.04
change main ports: randomport1 for SSH and randomport2 for SFTP
configure SFTP in sshd_config file
once everything is working create local directory structure
by using a bash script
5.1 List what is in S3 and save in a var
5.2 for each of the files listed in s3 check if there is a new file not present in the mirrored file in the local directory s3-mirror
5.3 if there is new file fetch, touch a file with empy contents in s3-mirror directory just same name, move encrypted file to SFTP and remove fetched S3 file from mirrored local directory
5.4 record successful actions in a log.
So far it works good.