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Basically is that, i didn't saved the file, i was just starting doing it, but it took me so long to do it and i forgot, is there any backup file like in Autocad?
Have you set Revit to Auto-Remind you to Save? And if so, at what time intervals? The number of Backups it creates is controlled by a setting in "Options" > In the "Save as...." dialogue box
Sorry, You should save the file before u close the revit unlike autocad it wont save
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