DX Warning: Saved in a special recovery clip.

This is just informational.
As documented in the DX 6.2 SP1 Release Notes, page 5

Creation of a media list C-Clip
DiskXtender 6.2 SP1 creates a special C-Clip on the EMC Centera cluster daily at
midnight (EMC Centera cluster time). This new C-Clip contains a list of all media
C-Clips currently on the system. One C-Clip is created for each EMC Centera
media service. The Content Address for the C-Clip is stored in the DiskXtender
event log when the C-Clip is created. If a disaster occurs, an EMC Customer
Support Representative can retrieve the C-Clip to develop a list of media to restore
to DiskXtender.

Thanks, that helps. Any idea why only one server running DX would send the message as a warning one time while I've never seen it on our other servers running DX?

are the other DX servers running DX 6.2 SP1 (also known 6.20.090) as well?
This recovery clip was introduce only in DX 6.2 SP1