If you are/have using/used the same bibliography files across several machines (say a laptop and a desktop machine) of yours...
How did you solve the problem of consistency? With a version control system (e.g. git) and/or a web hosting service (e.g. Dropbox) and/or a USB drive?
What is your method to manage the bibliography file itself? Editing the .bib-file directly or with a tool?
Has anyone run into a problem with this issue as a whole? What did you learn?