I had to hit the Close button for the second archive also; I was still able to access the archive and the files after that. On the previous issue, with the files disappeared on the SSD, I did a disk check from Windows Explorer options (right click on the drive and then Tools), it said initially there are no problems, scanned anyway, found issues, recommended repairs, which I did, after that, the files were back on the SSD. I suspect the issue originated from the fact that I was archiving the exact...
This just happened to me, archiving got stuck at 99%, while archiving C:\Users\user_name\ :D . There are more than 150k files, about 300 errors during archiving, due to access denied or files being used by another processes. Funny thing, I initially archived that folder from C: drive, on an SSD, to another SSD. It got stuck, so after about 10 minutes I hit the Close button. And after, connected the SSD to the newer PC, in order to sync the user profile folder, as the ZIP archive was present, and...