Want a backup of your entire website that you can actually browse later, exactly as it looked? The answer is a WARC file — the same format that powers the Wayback Machine — and turning your whole site into one is simpler than it sounds.
WARC file illustration (Credits: How-To Geek)
A WARC, or Web Archive, file is a single container that stores a website in its entirety: its pages, files, media and metadata, preserved in their original form and context. It was developed through the International Internet Preservation Consortium, with help from Internet Archive figures Brewster Kahle and Mike Burner, and has been around since 2007, evolving from the earlier ARC format.
How to Turn Your Website Into a WARC File
Think of a WARC file like an album: each record has a header (the album title) and a content block (the tracks), holding the HTML files, images and other media that make up the site. That structure is what lets the file be moved safely and replayed faithfully, rather than just dumping a folder of loose files.
To make your own, start with a web archiving crawler — a tool built to crawl a site and save what it finds as a WARC. Point it at your homepage, set how deep it should follow links and which parts of the site to include, then let it crawl. The result is a single .warc file containing the captured pages. Because the format is designed for huge crawls, expect the file to be large for a content-heavy site.
To replay it, open the file in a WARC player or replay tool in your browser. The archived pages load as they were captured, letting you click through the site offline without the live server. That makes WARC ideal not just for personal backups, but for researchers, libraries and museums — the Library of Congress uses the format for its web archives, as do law firms and other institutions doing extensive research.
Two versions of the standard exist: WARC 1.0 (ISO 28500:2007) and WARC 1.1 (ISO 28500:2017), with the newer version fixing a quirk around brackets in the target URI field. For most personal archiving, either will work with modern replay tools.
The bottom line: if you care about a site surviving redesigns, shutdowns or link rot, a WARC backup beats screenshots and saved HTML. It is one file, it keeps the site’s structure intact, and you can browse it again any time in your browser.
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Source: How-To Geek — read the full story there.
