Sql-server – How to protect SQL Server 2012 Backups on Standard Editions

You cannot directly change edition of SQL Server 2012 from Enterprise to Standard. See this page for the supported edition change scenarios.

There are a few different ways to go about doing this -- some recommend making copies of the system databases and overwriting them on the new instance (make sure you're at the exact same SP/CU level), or you could just set up a new environment from scratch. It really depends on how complex your environment is. I would definitely recommend testing the process in a separate environment if you can.

Also, before you start, go through your databases and check sys.dm_db_persisted_sku_features to make sure there aren't any Enterprise edition features in use.

Since you are using Standard Edition, you cant use TDE. So other options are

Using encryption keys at instance/database level :

SQL Server has two kinds of keys: symmetric and asymmetric. Symmetric keys use the same password to encrypt and decrypt data. Asymmetric keys use one password to encrypt data (called the public key) and another to decrypt data (called the private key).

SQL Server has two primary applications for keys: a service master key (SMK) generated on and for a SQL Server instance, and a database master key (DMK) used for a database.

Also, you can have encryption at column level by creating a MASTER KEY ENCRYPTION along with CREATE CERTIFICATE and then CREATE SYMMETRIC KEY.

An example of how this can be done is described at Encrypt a Column of Data

Reference : SQL Server and Database Encryption Keys (Database Engine)

At Drive level :

Using BitLocker as it is a Drive Encryption data protection feature available Windows Server 2008 R2. Refer to : BitLocker Drive Encryption Overview There are many opensource or third party software to do the same job but at additional cost.

Note: The most important bit is ALWAYS backup your encryption keys.

You can use third party software like Redgate's sql backup which allows you to encrypt backups using passwords.

Depending on what level you need encryption will determine if it is worth upgrading to enterprise edition or not. You have to evaluate native TDE encryption vs encryption keys and certificates vs open source vs disk encryption.