It's file-based. If you have a copy open in one location, open a copy in a second, save the second, then make changes in the first and save the first, you can o

It's file-based. If you have a copy open in one location, open a copy in a second, save the second, then make changes in the first and save the first, you can override the second copy's changes. That said, KeePass 2.x (which came out in 2010/2011, but some people still use the old version) has synchronization built-in, and on top of that, there are plugins to make it keep backups or update a secondary database. It's the KeePass clones that have their own implementation of the internals where you can run into problems.