Bookmark managers with automated backups

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Bookmark OS is like Mac and Windows for bookmarks. It gives an intuitive and powerful interface for organizing your bookmarks.
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Raindrop.io is a bookmark manager that behaves as a single page app. It allows you to drag and drop, change icons, and sort your bookmarks.
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Wallabag is a read it later app for bookmarking articles and works on every device similar to Pocket.
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A privacy based extension that allows you to annotate webpages and has full-page text search.
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Zotero bills itself as your personal research assistant. It allows you to add citations and organize bookmarks in a list-based style.