The BLOCKSIZE parameter can be set for each backup operation. For restores, NetBackup for SQL Server automatically chooses the same size that you backed up with. BLOCKSIZE ranges from 512 bytes to 64 kilobytes. The default is 512 bytes. BLOCKSIZE is the incremental size that SQL Server uses for reading and writing backup images.

Set the BLOCKSIZE for your NetBackup for SQL Server session using the NetBackup client properties dialog box. Otherwise, you can use the BLOCKSIZE parameter to set this value when you create a batch file manually.