Thank you both. I have started to comb through my old TurboCAD files making a new directory for each substantial part with STEP files for most components. I am also saving all drawings as PDF and a text file describing anything that isn't clear from the models and PDFs. This may be a bit paranoid bu...

A question entirely separate from what is the best CAD package for any particular use is: What is the best file type to save CAD drawings in order to protect against the vagarities of the CAD software businesses? STEP files for each part? DWG files, or perhaps something else? I guess a subsidiary qu...