[Zope] keeping files in the local filesystem

Hi, I am a Zope newbie and would appreciate some counsel from experienced Zope users. I have come across several products (e.g. ExternalFile) for keeping files in the local filesystem. I was wondering about the wisdom of keeping objects, such as images, dtml documents, and page templates, in the local filesystem. On the face of it, it seems like a good idea since tools like version control/management and backup software could manage the files directly. What do you see as the upsides and downsides? Thank you for your input. Best Regards, gyro