If your hard drive is running out of space and you've noticed Revit is crashing more frequently, check the journal folder for extraneous Revit models. When saving a non-workshared model to a network drive, Revit will save a copy of the model to the journal folder located here: %LOCALAPPDATA%\Autodesk\Revit\<product name and release>\Journals
In addition to clearing out the journal folder, it's a good idea to clean the Windows %TMP% folder as well.
To automate the tedious process of browsing to the journal folder, or folderS if you have multiple versions of Revit installed, simply create a small BAT file with a few lines of code to silently delete any files not actively being used. Below is a small sample of what the code looks like to silently delete all files within the Revit 2018 journal folder.
@DEL /q "C:\Users\<User Name>\AppData\Local\Autodesk\Revit\Autodesk Revit 2018\Journals\*.*"
It's that easy.