When creating a FileVault with Knox, does the size you stipulate mean that that much space is “taken”, or that that much space MAY be taken as items are added to it? Is that what you mean by “stretchable vaults?”

The latter. The vaults can grow up to the size you specify. The reason we ask is that you can save some overhead in the vault file size if you know that you will never store more than a given amount of data on a vault.

thanks