None in Florida.  A "legible image" will suffice. 

Having said that, you had better have those images at the ready, in case of an audit by the Real Estate Commission, or the IRS, or if you are in a civil suit.

I keep no paper copies, and everything in my office is saved on a cloud now. I also keep all my email communications. I have needed to go back and pull them from years ago!

It depends on your state rules. Check those.

I am sure it varies by state, but in the interest of saving and employing a few forests it is good to print lots and lots.

That's a good question for your broker. State real estate laws will likely govern what records must be kept

Our office is entirely paperless, so none.  It's all in the cloud just floating around out there.  

My State requires a broker to keep documents for three years as long as they are retrievable for review upon notice.

Many offices no longer retain orininal copies. Follow the rules in your state.

Paperless means paperless! Include ALL documents in it....

Follow your broker's guideliens.  It's different in various jurisdictions.  I just make sure there are copies of everything in my brokers file.

Please consult with yuo state laws and your broker.

It depends on your state commission.

It depends upon the laws and regulations in your jurisdiction.

For your RE deals, none!

Whatever your state requires to be compliant.

My office is paperless and the only time I print a file: if a client specifically asks me to do it for him/her. 

I'm in California.  The only papers that NEED a wet signature are notarized stuff, escrow & loans.  Some banks require wet signatures on the purchase agreement for certain types of homes though.

I do most everything paperless, but I ALWAYS keep a contract or two handy and I ALWAYS keep a paper purchase agreement with me.  Sure, I can pull out a tablet, hook it up to my phone's hot spot and be all electronic... but in the time that would take to setup I can have the paper contract 50-75% complete!  Paper contracts don't need batteries, reception and you don't have to worry about glare or system/app/website issues.

Paperless is great, I'm certified in paperless/epro stuff and I aim to be 100% paperless in all my transactions (with the obvious exception of marketing materials), but hard copies are a great backup and more "real" for many people.

we still have paper....but most agents are paperless in our office.... we DO have a few old school and if I were still active, I would not be paperless.... 

I pay bills online, but I want to see a bill, too.... it gets mailed!!!  just an old school mentality.... I am who I am.....

Almost anything can be stored and produced as needed without hard copies.

I think each state would be different

This will likely be determined by your state and/or brokerage requirements.  

Keep every document, every text, every email, every memo to the file.  They can be pdf files.

Talk to your broker

Following the rules of your state will help. We put all of ours in the cloud..easy to access and print if necessary!

Whatever the requirements are in your state.

Anything you'll need to defend yourself in the instance you get sued years down the road.

We use DotLoop to put everything on the cloud

I do not have any paper documents for several years.

I have a softcopy I retain them in my cloud. The brokerage cloud keeps them for 7 years.  Have not seen a hardcopy for years. 

Once we reach heaven there will be no standing room left. They are piles piles of pdf files. I will have to stand on top of earlier realtors from Red carpet or C21.