Hi @Anonymous,

I don't work for Apple so I can't guarantee anything but I have never had data loss occur when doing an incremental upgrade.  Occasionally upgrades can cause folder permissions to get  a little messed up but a quick uninstall and reinstall of AutoCAD can remedy that.

Of course I would recommend that you perform a backup frequently. I use the built-in Time Machine and it seems to work great. Worst case if you don't have an external drive to backup to, at least make copies of your files on a cloud-storage such as iCloud, Dropbox, Box, OneDrive, GoogleDrive, etc.

As scary as all that sounds, I don't anticipate that you will have any issues at all. I have upgraded three of my personal machines without any issue at all.

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