For those with Akeeba Backup Pro installed having issues creating the remote backup in multilingual sites (there is only a pending backup of 4b size) this is an issue caused by language code added to urls. Adding the language to the url cause the url to launch remote backups not to work.
This can be solved changing one setting into the "System - language filter" plugin:
Setting the "Remove URL Language code" to Yes the language code will not be added to the default language set in the site. This is, instead having www.yoursite.com/en for default site we will have www.yoursite.com