The .BBB extension refers to files of the type, =BlackBerry backup= files. These are backup files created for typical smart devices manufactured by BlackBerry.

Usually these backup files are created by a desktop backup application whether on windows or Mac depending on the BlackBerry Backup client software. Thus these files are handy to restore cruicial data stored in the BlackBerry devices in case of a memory failure.These files are designed in such a way that they can also be used for regular sync-up operations thus, serving a dual purpose.Most of the time, these files are used for restoration of contacts and calender items from one phone to other.