Hello and sorry for the late reply. Your message came in just as I had logged out for the day (different timezones, sorry) and my support staff didn't feel comfortable answering a server configuration ticket.
Akeeba Backup is a complex plugin, therefore the package is very big as plugins go (almost 6Mb). This is indeed larger than what many shared servers are configured to handle. While you could address that by changing php.ini settings it's best not to touch that at all and simply follow the manual installation procedure:
- Download Akeeba Backup's ZIP file.
- Extract it locally.
- Upload the akeebabackupwp folder inside your site's wp-content/plugins folder by FTP.
- Log in to wp-admin
- Go to Plugins
- Activate the Akeeba Backup plugin
If you would rather fix the PHP configuration, please do ask your host where you should put additional PHP configuration directives. It's usually in the php.ini file inside wp-admin or a .user.ini (mind the leading dot!) in your site's root. The configuration directives you need are:
upload_max_filesize = 10M
post_max_size = 10M
you can do the same thing by adding the following to your site's .htaccess:
php_value upload_max_filesize 10M
php_value post_max_size 10M
I reckon that trying the .htaccess method first is easier.