Recover Meteor JS MongoDB from Time Machine Backup
Yes - use tmutil to see if the files you are missing were even backed up:

tmutil isexcluded /path/to/the/folder


If you don't have them backed up, you'll have to redo the work. If you did have them backed up, you can copy files using terminal from the destination to your desktop:

cp -rp /Volumes/Backup/Backup.backupdb/host/2015-08-25-000102/Macintosh\ HD/path/to/the/folder ~/Desktop/