Based on a recommendation from the author of BackWPup I installed this plugin to try to restore my web site from a backup. When I tried to use it I found that Adminer has a limit of 32Mb on the file it can import. My site's backup file is 200Mb.
So I'm heading back to phpMyAdmin which has a limit of 1024Mb.
Why have you put such a tiny limit on the size of the import file?