Encrypted softraid - Operational question

Hi misc,

In a server with an encrypted root - server boots with key in USB stick,
not passphrase.

Can I remove the USB stick with the key, after the server is up and
running? Will I have any problems doing that?

I know that in the case of a reboot, it will be necessary to go and
re-insert the USB stick holding the encryption key. I plan to use a good
UPS/batteries to avoid that.

Thanks in advance.