Hello,
My "Revelation file" is kept in my Home folder. I also backup the file often, copying it to an external drive.
Whenever I install some new Linux version to my computer, I restore the file from backup to my new Home folder. Then setup Revelation to "Open file on startup" in Preferences under Edit.
Do you have a copy of your Revelation database backed up some place? It's a single encrypted file containing your account and password information, saved by default to Home. Remember what you named it?