Brian,
I think you are more than safe to keep everything electronically. The CPAs I have worked for were all moving to this and my wife's law firm just this summer scanned everything, then shredded the originals. Helped them cut cost by letting the lease expire on their second location where old files were stored. I am in VA and most everything like that even with the government is electronic...taxes, court fillings, etc....And my wife says the Federal Court requires things to be filled electronically as well.