WordPress Backup File Extensions: .zip, .sql, .daf, and More Explained

Your WordPress backup files likely end in .zip, .daf, or .sql. Those endings are called backup file extensions, and they tell you what kind of file you’re looking at and what it does.

For example, seeing .sql in a WordPress backup tells you it’s the database, the heart of your website.

When I first started working with websites, backups felt like a mystery, and I ignored those extensions. Once I paid attention, I could tell what kind of copy I was making and whether I had everything I needed.

Below, I’ll break down the most common ones you’ll see when backing up websites, so you can spot the file you need when your site is down.

Table of Contents

Backup File Extension List

Here’s our list of the most common backup file extensions.

What’s Inside a WordPress Backup File?

Before the extensions make sense, it helps to know what they’re wrapping up. Every WordPress site boils down to two things: files and a database.

A complete WordPress backup needs four pieces:

1. Core files: The WordPress software itself. These files run your dashboard and keep the site functioning.
2. The wp-content folder: Your themes, plugins, and every image you’ve ever uploaded. This is the part you can’t re-download from anywhere.
3. Configuration files: Small but critical files like wp-config.php and .htaccess. They tell WordPress how to connect to your database.
4. The database: All your posts, pages, comments, users, and settings. In a backup, this usually becomes a .sql file.

When a plugin like Duplicator backs up your site, it exports the database and bundles it with all your files into a single archive (usually a .zip or .daf). One file for the whole site.

If a backup is missing any one of these pieces, it can’t fully restore your site. That’s why I recommend full-site backups over files-only or database-only copies unless you know exactly what you’re doing.

What Are Backup File Extensions?

Ever see those letters at the very end of backup filenames? Like .zip, .tar, or .sql?

These are file extensions, which are clues about the file type. Think of them like little labels. They tell your computer what kind of file it is.

It’s just like a food label in your kitchen. Is it a can of soup? A box of cereal? A bottle of juice? The label tells you what’s inside.

File extensions do the same thing. They tell your computer if it’s looking at a document, an image, or a website backup.

Understanding these “labels” is really helpful. It helps you quickly spot your backup files. And finding them fast means you can restore your website faster.

Common Backup File Extensions

There are lots of different backup file extensions. It might seem like a jumble at first.

Don’t worry! We can sort through the most common ones together. Let’s explain what each one means without all the techy jargon.

.zip

ZIP is a common backup file format that supports lossless data compression. ZIP files are used to reduce the size of files and folders, and to bundle multiple files together into a single archive for easier storage and transfer.

Think about “zipping up” a jacket. You close it all together, right? ZIP files are similar. It’s a common file format to compress files and folders into one package.

This is the format that many backup plugins use by default. For example, when you make a backup with Duplicator, it’s usually a .zip file. It helps save space and keeps everything neat.

You might see a file named something like website_backup_today.zip. That .zip tells you it’s a compressed backup archive.

.tar

.tar stands for “Tape Archive”. It’s like a .zip file because it’s a collection of saved files. However, .tar files aren’t zipped.

You see .tar files a lot if you use Linux computers. It’s a common format in that world.

It is commonly used to create backups of directories and files. It’s often combined with compression utilities like gzip.

.gz or .gzip

GZIP is a file format used for file compression and decompression. It typically uses the .gz or .gzip extensions. GZIP is often used to compress single files, or to compress TAR archives, resulting in .tar.gz or .tgz files.

“Gzipped” just means it’s compressed using a special method. Think of it like squeezing even more air out of a vacuum-sealed bag.

.gz files are often used with .tar files. You’ll see files like .tar.gz. This bundles your files with .tar, then compresses them with gzip.

A file named website_backup.tar.gz is a .tar archive that’s been compressed with gzip.

.sql

.sql stands for “Structured Query Language.” Simply put, .sql files are for your database.

Your database is where all your website’s important stuff lives. Things like your posts, pages, settings, and user info. It’s super important to back it up!

You might see your database backup as website_database.sql. That’s your website’s database in a file.

.dump

.dump is a generic term for a file that contains a copy of data from a database. .dump files can be in various formats depending on the system that created them. They often require specific tools to restore.

In the context of databases, it’s similar to a .sql file but might be in a binary format or a different text-based format specific to the database system.

You could have a file named database_backup_Feb2026.dump. That’s another database backup file.

.bkp or .backup

.bkp is a very generic extension often used to indicate a backup file. .bkp files can be in any format, as it is simply a user-defined or application-defined extension to signify that the file is a backup copy of something. You’d need to know the context or application that created the .bkp file to understand its specific format.

.bkp or .backup are easy to read. They clearly tell you, “Hey, I’m a backup file!” They might not be as specific as .zip or .sql, but they are still helpful to spot.

You might find files like website_backup.bkp or full_site.backup. Easy to understand, right?

.daf

.daf is special! It’s a custom backup file format created by Duplicator, a backup plugin used by over 1 million website owners.

DupArchive was designed to avoid common timeout issues for large sites. It creates the backup in manageable chunks instead of doing everything at once and overwhelming the server.

It’s great at backing up or migrating more complex websites. I’ve seen it work wonders with really large sites (up to 400GB!).

If you choose to use a DupArchive, your backup files will be .daf files. You’ll get a file like website-backup.daf.

.wpress

.wpress is another plugin-specific format. It comes from All-in-One WP Migration, which packs your files and database into a single .wpress archive.

There’s a catch, though. You can’t open a .wpress file with normal tools like 7-Zip or your computer’s built-in extractor. It only works inside All-in-One WP Migration itself.

If you find an old .wpress file on your server but don’t use the plugin anymore, you’ll need to reinstall it to get your data back.

Do Full and Incremental Backups Use Different Extensions?

It depends on your backup software. Some tools give each backup type its own extension. Veeam, for example, uses .vbk for full backups, .vib for incremental backups, and .vrb for reverse incremental backups.

Others use the same extension for every backup, so you can’t tell the type from the filename. In that case, check the file’s name and date, or look it up in your backup tool.

If you use Duplicator, incremental backups are available on the Pro and Elite plans with Duplicator Cloud.

Why Are Backup Files Compressed?

You might notice that many of the formats on this list compress your data. That’s not an accident.

Compression is lossless. Nothing gets deleted or degraded; the file just gets packed more efficiently.

It works especially well for WordPress sites. Your database and PHP files are mostly text, and text compresses dramatically.

A backup can end up 70% smaller than the original site. (Images and videos shrink less because they’re already compressed.)

Smaller backups matter more than you’d think. They upload to cloud storage faster, take up less space, and download quicker when your site is down and every minute counts.

You don’t have to configure any of this. Duplicator compresses backups automatically, and its .daf format was built for big sites. There’s no theoretical file size limit, and it has handled real-world backups up to 400GB.

Why Knowing File Extensions Matters for Backups

At some point, you may need to get your website back online, fast. You go to your cloud storage or local server and see a long list of files.

Some have dates in the names. Some have cryptic words. Which one do you need to restore your website?

Without knowing file extensions, it’s a guessing game. It can feel overwhelming.

From what I’ve seen, people start clicking randomly. They open file after file, hoping to find the right one.

This takes time. And while you are searching, your website is still offline. That’s lost visitors. That could be lost sales.

But, if you understand file extensions, things change. Immediately, your eyes are drawn to .zip, .daf, or .sql files.

You recognize these extensions and instantly know: “These are my backup files!” No more guessing. No more random clicking.

Because you know what to look for, you find your backup quickly. This means you can start the restore process right away. Getting your site back online becomes much faster.

Every minute saved is important when your website is down. Knowing file extensions is an easy way to save that time and prioritize data protection. It makes website recovery less stressful and much more efficient.

Simplify Website Backup Extensions with Duplicator

When you back up your site with Duplicator (the free version or Pro), you download two main files. It’s important to know both.

The first file is the Archive. This is the saved copy of your website. Depending on your customization, it could be a full backup or individual database files.

Usually, this archive file will be a .zip file. This archive file holds everything. All your website files and your database, all together in one place.

The second file is the Installer file. Its name ends in installer.php, often with a secure code in front of it. No matter if you use .zip or .daf for the archive, it always comes with an installer file.

Think of the installer as the tool you need to open up your archive file and restore your website. You absolutely need this file.

So, with Duplicator, you are looking for a pair. A .zip file and the installer. Or, if you used DupArchive, a .daf file and the installer.

This two-file system is what makes Duplicator restores so easy, in my experience. No guessing which file to use. It’s clear.

For easy disaster recovery, upload both files to your site’s root directory. Go to https://your-domain/[hashed-secure-data]_installer.php in a browser window and follow the instructions.

For migrations, repeat this process on a different server. Easy!

Where Are WordPress Backup Files Stored?

Knowing the extension is half the job. The other half is knowing where to look.

By default, most backup plugins save their files inside your wp-content folder. Each plugin uses its own directory:

• Duplicator: wp-content/duplicator-backups/
• UpdraftPlus: wp-content/updraft/
• All-in-One WP Migration: wp-content/ai1wm-backups/

You can browse these folders through your hosting file manager or an FTP client.

If you use Duplicator, there’s an easier way: the Backups screen in wp-admin lists every backup with a download link, so you never have to dig through folders.

Your host may also keep its own backups, but those live outside WordPress entirely. Check your hosting control panel for those.

One warning from experience: don’t let your server be the only place your backups live. If the server fails, your backups disappear along with your site. Send copies to cloud storage like Google Drive, Dropbox, or Amazon S3.

Duplicator Pro connects to all of these storage locations. Both the free and Pro versions also work with Duplicator Cloud (with a Duplicator Cloud plan). When you upload backups here, you can restore backups straight from the cloud without needing WordPress to be functional.

Frequently Asked Questions (FAQs)

Backup File Extensions: Not So Scary After All

Backup file extensions might sound a bit technical at first. But really, they are just simple labels.

Knowing these common extensions gives you more control. You can confidently manage your website backups with no more confusion about what’s what.

And when you need to restore your site? You can do it quickly because you’ll know exactly which files to use.

Take a few minutes to look at the list we discussed. Familiarize yourself with .zip, .tar, .sql, .daf, and the others. It’s a small thing you can do today.

Need backups that can keep up with a site of any size? Download Duplicator Pro for scheduled backups, server-to-server imports, and more cloud storage options!

While you’re here, I think you’ll like these other WordPress guides:

• How to Back Up a WordPress Site
• How to Restore WordPress From a Backup (In Less Than 5 Minutes)
• STOP Making These Website Backup Mistakes
• WordPress Debugging Tools That Find Errors in Minutes
• How a Travel Website Handles 400GB Backups with Duplicator