We’re in the process of updating the documentation for Zotero 5.0. Some documentation may be outdated in the meantime. Thanks for your understanding.

In order to provide Zotero server service we store the following data:

Login information and sync activity: To ensure quality of service, we store data associated to your account, such as usernames and access logs that list IP addresses. We also monitor synchronization activity, such as log storage consumption.

Customized recommendations: With the launch of Zotero recommendation systems, server accounts may use Zotero library data to suggest, based on your preferences, works of scholarship that might be of interest.

Your choices

Synchronizing your data to the Zotero server is optional, although synchronization is strongly recommended in order to provide backup, collaboration, and recommendation services
You can choose to exclude certain collections or items from synchronization and backup
You can choose to share or not share your collections with other Zotero server users for scholarly collaboration
Recommendation services can be disabled in Zotero Preferences.
You can choose to exclude certain collections or items from being used to generate recommendations