You know that NAS can go in sleep mode, right? And wake up only when you try to activate them.
But what is the use-case? Only make your holiday films available to a media center? Or do you plan to also use it as a storage for other devices?
In the first case a sbc can do the trick (however can struggle if you share 4k). But I would definitely look into “real” NAS (Synology, qnas, etc.) before using a sbc.
It’s rather the other way around, Word is not 1 to 1 compatible with LibreOffice Writer when it comes to document editing. Writer is far better on that aspect.