I store my passwords in an encrypted database file in the cloud. That is, my KDBX files from KeePass are stored in a cloud storage server, let's say it's Dropbox. Dropbox, whether they admit it or not, probably keeps a very long history of my files. If someone were to attempt to decrypt my KDBX file, would it help them if they had successive copies of my KDBX file over time? I sometimes update just one line in the file and re-sync to Dropbox. Are these files engineered in such a way (i.e. without some sort of random seed) that would give someone great advantage in decrypting the file if they studied successive copies of the file?