Hi and welcome to the forum! The backup you’re uploading exceeds the file size limit if you upload it directly to the plugin; also, there is no way you can use backup plugins to restore a backup on free hosting. You’ll have to do the backup this way:
Good website administration requires making backups of your account regularly and storing them somewhere safe yourself. You also need to download backups in order to migrate website to other hosting accounts.
InfinityFree does not create or store any backups of free hosting accounts. It’s your responsibility to regularly create backups, and to store them somewhere safely.
and restore it this way:
If your website doesn’t use MySQL databases, moving your site is very easy. Simply upload all your files to the ‘htdocs’ folder on your hosting account with FTP or a file manager. If you have a PHP based website, check if it has any configuration files where a domain name or file path needs to be set. Update these values as required. If your website is using MySQL databases, you need to move the database contents as well and update the configuration of your website to use the database:
Backup…
Also, read the article where it talks about the file size limit as well:
Sometimes, when you upload a file, the upload is completed but the file is deleted immediately afterwards. This is usually caused by one of the following issues:
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