how to backup mass files I have uploaded, I use the 000webhost hosting for free
A few options
Download the public_html folder via FTP client like FileZilla
Backup your site using this tutorial Backup your website!
Backup your site using this method How to automatically backup your website!
how to download using ftp client? I really do not understand
Download FileZilla https://filezilla-project.org/download.php?type=client
Connect using your 000webhost.com details
user: usr from usr.000webhostapp.com
pass: xyz whatever you set
security: NULL/ PLAIN NONE
ohh ok ok, thankyou :)