NFB is the extension given to files by Nokia PC Suite. It is a data management tool for Nokia phones using a computer. After connecting the phone to the computer, the program allows you to make a backup of the data in the phone memory, which is saved in the NFB file.

The NFB copy allows you to restore the phone to the condition in which it was made. This solution was used in older Nokia models. Currently, this format is rare and considered obsolete.