What is a CBU File?

How to Open, Edit, & Convert CBU Files

Screenshot of the CBU file icon used with Comodo Backup

A file with the CBU file extension is a Comodo Backup file that's created with and used by the free backup program called Comodo Backup.

When a backup is made in Comodo Backup, one option is to save the information in a CBU file so that it can be opened again in the future in order to restore those files. The CBU file may hold files, folders, registry data, email information, IM conversations, web browser data, or even entire hard drives or partitions.

Some CBU files may instead be Conlab Update Information files, but I don't have any information on what they're used for or what program is needed to open one.

How To Open a CBU File

CBU files need to be opened with Comodo Backup. The program also lets you build backups in the ZIP or ISO formats.

To open a CBU file in Comodo Backup should be as easy as double-clicking the file. However, if that doesn't work, you should first open the program and then go into the Restore section. From there, you can browse for the CBU file from the My Computer, Network, or FTP Server tab.

Note: If you've just recently backed up your files to the CBU format, you should see it listed under the Recent Backup section. That way, you don't have to browse for the file manually.

Once you've opened the CBU file in Comodo Backup, you'll be asked what you want to restore out of the backup and where you want to restore it. To restore everything, just make sure the first checkbox is checked so that everything inside it will be restored. Otherwise, click the small plus sign next to the folder to expand it, and then select each individual subfolder and file that you want to be restored, and uncheck the ones you don't want to restore.

Once everything you want to restore has a check by it, you can choose a custom folder to restore the files to or you can let Comodo Backup restore everything to a default folder, which is shown toward the bottom of the "Restore Destination" screen. Just hit Restore Now to finish the restore.

You can also mount a CBU file as a virtual hard drive in Windows so that it shows up in Windows Explorer along with the C drive and other hard drives that are connected to your computer. It might be easier to restore files this way since it's a bit more familiar than using Comodo Backup. You can read how to do that in the Comodo Backup Help pages.

Note: If you can't get your file to open in Comodo Backup, it's possible that you're not dealing with a CBU file at all, but instead a file that has a similar extension, like a CBR, CBZ, CBT, CB7, or CBA file. All of those file formats are spelled like CBU but are actually CDisplay Archived Comic Book files, and therefore open differently than CBU files.

If you find that an application on your PC does try to open the CBU file but it's the wrong application or if you would rather have another installed program open CBU files, see my How To Change the Default Program for a Specific File Extension guide for making that change in Windows.

How To Convert a CBU File

Comodo Backup is the program required for opening CBU files, but there isn't an option to convert one to a different format. The CBU file needs to remain in the format it's in, anyway, or Comodo Backup won't know how to open the file, which means you could potentially lose the files you've backed up if you try to convert it with a file conversion tool.

More Help With CBU Files

See Get More Help for information about contacting me on social networks or via email, posting on tech support forums, and more. Let me know what kinds of problems you're having with opening or using the CBU file and I'll see what I can do to help.