I am a massive fan and user of MX Player, however doesn't MX Player have so many different app settings, playback configurations etc to contend with?
Wouldn't it be great if we could Backup and Restore all these settings in the event of an Android device failure, or migrating between Android devices or just for selective Backups of custom settings for restoring any whenever we choose.
Starting from MX Player version 1.7.25 this is all now possible
It is achieved via the Import / Export feature found in Settings>General, please see attached screenshots (of English language version) which act as a visual guide into how to do this.
How to Export settings
How to Import settings
Another diagram picture summary