Hello @shawn_delahoussaye ,
Thanks for reaching out to us on forums.
Kindly note, this behavior is expected. When a drawing is opened using Detach, AutoCAD treats it as a temporary working file and disables automatic backup (.bak) creation. The “_detached” suffix indicates that state. This is same with Revit - Revit does not create backup files for detached models. If the "_detached" remains in the filename, backup files will not be generated. Removing "_detached" from the filename allows Revit to create backup files again.
Once the file is saved normally (removing the “_detached” from the filename), it is treated as a standard drawing again, and backup file generation resumes as expected.
I believe this answers your query. Please click on 'Like' and 'Accept Solution'.
Thanks!