How upload backup files in server and in which folder
What backup files do you mean? If you're talking about a database backup, you'll need to import it through phpMyAdmin or similar.
Yes database backups file
Do you need to make a backup and download it, or are you restoring from a database backup?
a error comes "No data was received to import. Either no file name was submitted, or the file size exceeded the maximum size permitted by your PHP configuration"
See above post, error comes