Did I backup my key ? Kleopetra

Hi,

So I started using encryption for my emails, and I wanted to backup my key for the case that my laptop explodes, or something else.
So I went into Kleopetra right-clicked on my key and did "export secret keys" and saved the thing on an external usb stick. Is it now possible with the file that has been created on the usb stick to decrypt my emails in the case that my laptop dies?

Thanks for reading,
oldman