Find a software converter able to convert sbu files to spb files.
Samsung smart phone users frequently wonder how to get their contacts from SBU backups to a SPB file. SBU is a full backup of phone and also contains other data like pictures or music, and also the contacts. SPB is just a file for contacts.
There is currently no app that would allow users to directly convert SBU to SPB. However there are ways how you can achieve this.
The easiest way is to use a program like SBU Extractor to extract the contacts (usually *.vcf), which can be then imported to Samsung Kies and saved as SPB.
The other way would be to start the process of backup restoration in Kies and cancelling it just before it starts. This should result in a creation of a temporary folder with the contents of the SBU file in Kies directory. But that method can be tricky as it can fail and overwrite your files. So the first method with SBU Extractor is more advisable.
Unfortunately, there is no detailed software record in the database for this conversion.
Articles and other information relating to sbu into spb conversion:
How to extract contacts and other data from Samsung Kies SBU backups - Getting mobile contacts out of SBU files
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