Data Retention. A vendor's obligation to retain data may depend on the amount of data and/or the length of time that the data is stored. The vendor may offer archiving services, for a charge. Be sure to understand how much data may be stored and for how long without incurring additional cost.
No the EIN is the Federal ID for the business. The state ID is different, and on most W-2's the state ID is towards the bottom. You have to apply for an EIN from the Federal Government and you get the State ID from the state. They are entirely different. Different states have different policies, so it might be the same...
An Employer Identification Number, or EIN, is essentially the same thing to your business as a Social Security Number is to you personally. An EIN is necessary to file tax returns, open bank accounts, apply for licenses and request loans and credit cards.