Fatal Error on my Node

Yes, use a PowerShell: How do I check my logs? - Storj Docs and filters like -last 20 or pipe to sls like

Get-Content "C:\Program Files\Storj\Storage Node\storagenode.log" | sls "fatal error" | select -last 10

You may also stop the storagenode service either from the Services applet or from the elevated PowerShell:

Stop-Service storagenode

move "C:\Program Files\Storj\Storage Node\storagenode.log" to the archive and start the service back

Start-Service storagenode

Or setup a logrotate for Windows or use the PowerShell scripts like Native logs rotation in Windows with a simple PowerShell script to do not do it manually.