This situation should be a "take note" opportunity for others on this "line" that it's not just important to back-up your SAS data but also your SAS source code (with multiple versions to CYA), including any SAS object catalogs (INFORMATs, FORMATs, compiled SAS macros).
And you may want to just test the waters with your Stg Admin, inquiring about "how do I go about requesting that a driver/directory (file system) be restored, please - oh, yes, and how many backup-versions are maintained for my 'production' server machine?" Just a few thoughts for the morning.
Scott Barry
SBBWorks, Inc.