I have mine overwrite. If i have a new FF install, when i sync with foxmarks it will be the same as on my other PCs. Also, i thought there was an option to use your own server for the bookmarks. ....here it is :
Can I use Foxmarks with my own server?
Foxmarks currently supports both FTP and WebDAV (via HTTP or HTTPS). Just fill in the appropriate server settings on the Foxmarks dialog (including the "Advanced Server Settings" on the "Other" tab) to connect Foxmarks with your server. In our experience, WebDAV is faster and more robust than FTP, but both work. Recently we've made some improvements to optimize network utilization, but those improvements are available only to WebDAV installations. Moving forward, FTP will probably not be so well supported, as it's just a more limited server.
If you use your own server, we're less able to help you with problems that you might encounter. Caveat switchor.
The Setup Wizard assumes that you're using the Foxmarks server, and knows how to set up accounts only on sync.foxmarks.com. If you're using your own server, don't use the Setup Wizard (press Cancel when it starts).
While we can't provide support if you're using your own server, we're collecting information provided by users who choose to go that route.
Can I run my own Foxmarks server?
You can run parts of it yourself. Foxmarks was once based on the Open Source Application Foundation's Cosmo Server, which you can download and install yourself. For a variety of reasons, mostly related to the volume of traffic we handle, we're no longer using Cosmo, but Foxmarks remains compatible with it.
Foxmarks should also run relatively well with any WebDAV server and less well with any FTP server; see the question above. --Todd 11:06, 2 March 2006 (EST)