I don't think that dada encryption would help in preserving users information nowadays.
While 5 years ago having 8 character long alphanumeric password (combination of asci leters and numbers) was considered safe (would take more than a year breaking it by brute force attack), nowadays this same pasword can be cracked in just a few days on a single computer (using combined power of multicore CPU and GPU). Not to metion how quickly can this pasword be broken using the power of cloud computing (probably just a few hours).
Also knowing wich encryption algorithm has been used to encrypt data in the first place makes decrypting it a lot easier.
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