I finally got around to running the DAOS estimator tool on our main domino server today. Below are the results.
Total DB's analyzed: 1171
Total DB's skipped due to errors: 0
Total Size of NSF's Examined: 264.7 GB
Total Attachments found: 623650
Total Duplicate Attachments found: 294805
Total DAOS Eligible Attachments: 623650
Estimated Size of DAOSified NSF's: 25.9 GB
Estimate Size of DAOS dir: 132.1 GB
Total Disk Savings: 119.3 GB
WOW, almost 50% disk savings! I guess we bought too much disk for domino last year. We have over 1tb available for domino apps.