I appreciate that. But if vbox is able to trigger a buffer flush, then the method I describe is still a hell of a lot more secure than a power failure.
Keep in mind that when a 'Shadow Copy' of an NTFS volume or an LVM or whatever, the results are pretty much the same. What you get is a copy of the filesystem/disk, in a crash-consitent state.
Im suggesting that perhaps it is a hidden, or command line only option? I didn't come here for a lecture about data security. For all you know, the machine is serving mp3 files and really has no care if the most recently added mp3 file makes it into the backup or not.
Regarding the hand holding of your users, the last time I snapshoted without specifying '--pause', it trashed my (testing) VM. Gone
(See this post, which looks like it was caused also by forgetting '--pause': https://forums.virtualbox.org/viewtopic.php?f=7&t=44906
So no, VirtualBox is not idiot proof, nor should it be.
If us power users and/or engineers wanted idiot proof, we would still be using a system akin to an apple 2e.
But thanks for hijacking my thread, speaking of which, is the option there or not?