The word LIGHT come from association with film in the camera being exposed by light, thus LIGHT associates with films (aka movies), which is all digital these days - no more film cameras of course.... But the association is still there.
the word VAULT associates with security, and place that is not easy to penetrate or steal something from. Bank vault, safe, etc.
So the ideal design would have two elements working together:
1. Security (ideas/keywords- guardian, lion, safe, Vault, fence, shield, armoured box, mountain, fort, protection, etc)
2. Movies (keywords for you - digital file, IO, data transfer, file transfer, digital storage, film reel, light, projector, zeros and ones, bandwidth, film frame, TV, digitalization, cloud, server, spark, lightning, flash, etc!)