I spent a lot of time recovering a Pr Pro CC 2013 project into Pr Pro 2019 and recovered most of it -- ready to move on but curious about the different file sizes of the project and attempted exports.
5.1 MB recovered prproj
16.5 GB exported quicktime (.mov)
629 KB recovered project Eported as Premiere Project
1.7 MB recovered project Exported as FCP XML file
Not surprised by the quicktime file size but why do the prproj files vary so much?
I was unable to export as .aaf.
Was able to import the XML file into Resolve and all clips came in except Pr Pro titles and subtitles (from CC 7), which is not terribly surprising.
Independent/personal/avant-garde cinema, New York City
This is just a guess - hopefully someone smarter will chime in.
Your original project also contained data tracking for all preview files. Your 2019 version is no longer tracking the old preview files, since they are not there to track.
Dell Precision T7600 (x2)
Win 7 64-bit
Adobe CC 2017.1 (as of 8/2017)
256GB SSD system drive
4 internal media drives RAID 5
Typically cutting short form from UHD MP4, HD MP4, and HD P2 MXF.