I had to move a WordPress site from a test server to my localhost. When I finished my changes I went to run an Akeeba backup, but got the error that the default directory wasn’t writable.

I found this article that helped me.

https://www.akeebabackup.com/documentation/warnings/ch01.html#q001

The solution was to go into Akeeba  >> Configuration Page >> in the output directory field put in “[DEFAULT_OUTPUT]”.

I hope this helps someone else out there…