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Please ZIP and attach your failed backup's log file. The information we need to help you is in the log file. If the log ZIP file is more than 2MB please upload it somewhere and give us a link to it.

You are trying to transfer a backup archive that's 330050488 bytes (314.76 MB) through WebDAV. This will take a very long time. However, your server is set up so that PHP times out after about 10 seconds. This is not enough time to transfer the backup archive.

Please see https://www.akeebabackup.com/documentation/akeeba-backup-documentation/how-to-cloud-backup-basic-config.html under "Most failed uploads are caused by timeouts".

You need to set up a Part Size for Split Archives that's small enough for your server to be able to transfer each backup archive part file to the remote WebDAV server without timing out. This depends on the data transfer speed between your web server and your WebDAV server. Typical values that work are 20MB, 10MB, 5MB, 2MB or even as small as 1MB.

Please remember that you will need all of the backup archive part files to be present in the same directory when restoring your backup. The parts will be discovered and extracted automatically but they must all be present during the archive extraction.,