Files with jbk suffix are in most cases backup files, for example those created using Juno service.
There is one other file type using
the JBK file extension!
.jbk - Jot+ Notes backup file
What is jbk file? How to open jbk files?
File extension jbk is mainly related to Juno Dial-Up Internet Service and used for some sort of backup file. A .jbk file contains backup of emails, address book, account settings.
Enter any file extension without dot (e.g. pdf)
Search for file extension details and associated application(s)