You can do that. But WinSCP won't help you much with it. You have to do it on your own.

Got a situation at work I am trying to figure out. We got a new server appliance and I want to backup certain files from this server to a NAS. I can do it using FTP but because of the nature of my job and the files, it needs to be secure. I'm able to use the SCP protocol to back these files up to a NAS but the NAS does not support SCP. The NAS supports SFTP but not SCP... I was thinking a script could be written to move these files using SCP and then upload them to the NAS using SFTP... Is this possible? To save time, Id like for the WinSCP to copy them directly over and not to a local directory first. Thanks!