[The Duke]

"If you encrypt them before using a service like MoveIt, a breach of MoveIt doesn't cause any records to be breached, because they are all encrypted by another program and key."

I would not be surprised if various US government agencies didn't have master keys to decrypt anything encrypted with common encryption products.

Still, it would be much safer to pre-encrypt.

[ConservativeMind]

Don’t send databases of customer data to another company, through software that promises they will encrypt everything they get (so don’t hassle with pre-encrypting, they say), because they can be breached and that breach bypasses all of their security, leaving your files in plaintext to be sorted through at their leisure.