Fusion crashes unexpectedly, corrupts backup file, last actual save is 2 days of work old!!!

[reinigrauer]

Help!  I have all the backup files for this project but when I renamed the .backup file to .f3d it says "the path is not a valid zip package".  I copied the backup file, renamed it to .zip, and used a .zip repair tool to repair the file.  Now I can open it with file explorer and see there is stuff in there (the file somehow lost about 1mb in size after repair) but when I try to import it into fusion 360 is says "Initializing segment meta stream failed!  The file could not be loaded".  Is there any way to recover this file or am I SOL?  This is now the second time Fusion has crashed on me, corrupted the backup, and wasted days of work.

The file I "repaired" with the zip repair tool is the one marked recovered.

[TheCADWhisperer]

How frequently do you save your work?

Rather than attempting to recover a file from a crash, can you open a previous Version?

[reinigrauer]

I usually save frequently but when I'm in the zone I often forget about it.  Regardless, the software should absolutely not generate corrupt recovery documents.  If there is even a situation where the software can generate a corrupt one, there needs to be a mechanism for either saving multiple backups over time (to let a user pick the most recent one that isn't corrupted) or to not actually overwrite the last good recovery file until the new one has been tested good by the software.  There is no point to an auto save feature in mission critical software like this if it doesn't always generate valid files.