Akeeba Backup 3.1.5 and later include the Configuration Wizard feature. This is an automated process which will benchmark your server's performance and try to fine tune common configuration variables for optimal backup performance. The Configuration Wizard settings are applied to the current profile only. If you want to fine tune a different profile, you have to select it from the drop-down list in the Control Panel page before clicking on thebutton. Do note that using the Configuration Wizard has the following effects:
Your backup type is switched to "Full site backup"
The archiver engine is switched to "JPA (Recommended)"
If you want to use a different backup type and/or archive type, you can review the configuration changes after the wizard is finished.
The Configuration Wizard page
The Configuration Wizard will automatically fine tune the following configuration parameters:
AJAX method (use AJAX or IFrames)
Optimize the minimum execution time so as to make the backup as fast as possible without your server throwing 403 Forbidden errors
Adjust the location and/or permissions of the output directory. Useful if you just transferred your site to a new server or location.
Optimize the database dump engine settings to make database dump as fast as possible, while avoiding memory outage errors
Optimize the maximum execution time so that as few steps as possible are performed during the backup, without causing a timeout
Automatically determines if your server needs archive splitting.
The Configuration Wizard does not address the archive splitting required when you are using a post-processing engine (such as backup-to-email, S3, Dropbox, etc). If you are using post-processing you may have to manually set the Part Size for Split Archives to a different value manually.
At the end of the wizard process, you can either try taking a backup immediately or review and possibly modify the configuration parameters.