Vault size, desktop, resources of comuter?

Not white cryptomator desktop as this app does not interact with your online storage at all.
You might be interested in this:

You can store your local vault wherever you want. Just select „custom location“ when creating the vault, or move an existing vault to a new directory.
But if you want to have that vault synced with an online storage, don’t forget to configure your sync client so that the new vault folder destination is included in the sync.