efs backup

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if i have that files on my phone it means that i have an efs backup? the files appeared when i installed a custom rom i think or smthing
sry for the noob question and my english

Some rooms have an automatic function to backup the EFS folder to the sdcard or extsdcard, so if you have that folder inside the sdcard or extsdcard then it is a backup, cause the original EFS folder must be inside the root filesystem

Seeing the location of the files, looks like it is a EFS backup.