That's very strange. The first backup to that dedupe storage location should be along the lines of the 1.0:1 ratio. Not the third backup of 4.
(FYI - Dedupe ratios can jump around from 4971:1 to 3577:1 and back again; when are talking about ratios that high even a small bit of new data - say, for example, something in the registry changed or the system state of the machine was altered ever so slightly - can have a big effect on the ratio.)
I'm intererested in the device names in the the job list there. You have Dedupe Storage Folder 1:1 and 1:2; are these unique deduplication storage folders on the SAME BE media server, or are these folders on different BE media servers? We only allow 1 dedupe storage folder per phsical media server, so if you have more than 1 per media server, then we have other issues here.
Are you by chance running in a CASO environment with multiple media servers, where each media server has deduplicated storage folders?
Thanks,
Aidan Finley
Sr. Product Manager, Backup Exec