Syncing all data without using Zotero's servers
How can I sync all of my data using my own server and not Zotero's?
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However, if the concern is with attachment data (as opposed to the library items' metadata) you can sync to your own WebDAV server, either by setting up a "normal" WebDAV server or using my php program, phpZoteroWebDAV, which is written in php and provides both a sync server for attachments and a viewer for both library and attachments. Note, though, that in the case of using a WebDAV server for attachment sync the bibliographical metadata of your items is still synced to zotero.org