Under the suspicion that the hdat_file_* may be related to change block tracking, I set change block tracking globally to volume C only in the advanced settings on the server. I uninstalled the client and removed the client backup from the server to start over. However, upon reinstallation of the client, the CBT info shows
Volumes with active change block tracking and no crash persistence (v2.16): F:, E:, C:
So limiting change block tracking to Volume C did not seem to have worked. The setting seems to have transferred to the settings.cfg file on the client, which includes the line “cbt_volumes_def=C”. What am I doing wrong here.