This is a simple job for any PHP developer.
I need 2 PHP files to backup my website. I will be calling both files using cron.
The first PHP file will run nightly. It must backup 4 MySQL databases and save a zip file of the 4 database backups.
The second PHP file will run twice per week. It must back up the entire public_html folder and save a zip file from that folder.
I do not prepay, but I will fully fund a milestone for the completed project.