Saving SQL Server backup file in multiple parts

Normal backup

SET STATISTICS IO ON

SET STATISTICS TIME ON

BACKUP DATABASE DBNAME
TO DISK = 'D:\DBNAME.bak'

SET STATISTICS IO OFF

SET STATISTICS TIME OFF

to split the size into 3 use the following code, it will split the size of 3 gb into 1 GB each file you can add more files or less depending on the size you want

SET STATISTICS IO ON

SET STATISTICS TIME ON


BACKUP DATABASE DBNAME TO

DISK = 'D:\DBBackups\ReportServer\DBNAME _Split1.bak'

,DISK = 'D:\DBBackups\ReportServer\DBNAME _Split2.bak'

,DISK = 'D:\DBBackups\ReportServer\DBNAME _Split3.bak'


SET STATISTICS IO OFF

SET STATISTICS TIME OFF