Conversion of vcf files to nbf file format

It doesn't seem to be possible to convert or otherwise import vCard contacts (.vcf) to Nokia backup (.nbf) files, simply because NBF backups are generated from the SD card, not the internal memory of the phone and as such does not contain address book, contacts and other data etc. and as far as we know there is no way to generate that kind of file from contacts files.

Open VCF file    Open NBF file