Hello,
In case third party tool, LightSpeed is not an option, following basic backup script can be used:
backup database DB1 to
disk= 'DiskA:\DataFolder\DataFile01.bak',
disk= 'DiskB:\DataFolder\Data'File02.bak,
disk= 'DiskC:\DataFolder\DataFile03.bak' with init
Ex. if DB1...