I believe you should speak to your host. This error indicates that the filesystem is broken and they need to run a filesystem check ("fsck" or a similar tool) on their server.
More information (for the host's benefit): the line which throws the error message is a simple file existence check:
if (!file_exists($inifile))
The part that takes more than 50 seconds to complete is the file_exists call, a standard PHP function which checks if a function exists. PHP queries the operating system about the existence of the file. If it takes more than 50 seconds for the operating system to reply whether the file exists it probably means that the filesystem is damaged. If you are looking for the possible place where the filesystem is broken look at administrator/components/com_akeeba/BackupEngine/Core, administrator/components/com_akeeba/BackupEngine/Postproc and administrator/components/com_akeeba/BackupPlatform/Joomla3x/Config (these are the paths with files which would be the target of the code line in question)
Nicholas K. Dionysopoulos
Lead Developer and Director
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