vim: how to disable vim backup file when launching vim command?

vim backup file is great in 99% scenarios, but it's annoying to create
an un-wanted file in some system directories, especially in dirs that
contains configurations for apps.
how, can I disable the backup file creation, right when I launch vim to
read a file?

I know another workaround is to just launch vim without any file, turn
off backup file creation, and then open the files...


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