Two thoughts:
1. Let pt's know you are retiring and give them a paper copy of their chart or continuation of care document and all imported things on a flash drive, may be a little time consuming but then you could have a record signed saying that they received the chart and get you off the hook to a degree.

2. Contact one of the hospital run clinics and see if they will take the records. I know it may not the type of care you want for your pt's but then you could retire in peace, the way it should be.