We have 500 donors, of whom 50 give over $1,000 and another 50 give between $500-999. We do a decent job of keeping in touch with these 100 donors, usually talking to them by phone or visiting the top 20 largest donors at least once a year. I keep all the information on these donors and I am retiring, so cleaning out my files and getting ready to pass this information on to the next person. I have pages of stuff on some people, and almost nothing on others. But what should I have? And what should I delete?