Backups created in Samsung feature phones are supported by MOBILedit Forensic. 

Simply click the Import data button on the lower centre section:

Proceed by selecting the Samsung feature phone option:

Select your desired backup:

Continue with the standard acquisition by clicking Next:

Backup files from Samsung feature phones have to be created in the device itself by using their built-in feature. Newer models support the SmartSwitch backup option, which is also compatible with MOBILedit Forensic.