Is there any reason why you wouldn't use data deduplication?

"It may not be worth the time and expense to implement."
--Neal L. Wimbiscus, manager, NCS server support, Chicago Transit Authority

"Two reasons: Dedupe can actually increase the size of your stored data when you have a compressed stream going through a device to your SAN. The second is compliance: One would essentially be rendering any data headed for a write-once vault corrupt by removing redundant data."
--Tory Skyers, senior systems engineer, Prudential Fox & Roach Realtors/Trident Group, Devon, PA

"No. We have been overtaken by high-profile projects and need to look into options to alleviate our backup and storage concerns."
--Steve Rice, Unix administrator, U.S. Navy