Linux Perform MySQL Backup to time-based path from Webmin

MySQL Database Server > Module Config > Chose Yes on "Do strftime substitution of backup destinations?"

It work for me! :)

You can use dynamic path, but before you must enable it in module config:

System > Filesystem Backup > Module Config > Do strftime substitution of backup destinations? > Yes

(If you are not sure about placeholders, just click on the text "Do strftime substitution of backup destinations?" in the config and help will show you.)

I had the same problem and solved like this :

From Server select MySQL Database Server. Go to Module config (top left), and select Do strftime substitution of backup destinations? to Yes.

I use db_%d-%m-%Y.sql format for backups. (db_13-03-2013.sql)