Best overall: Backblaze

See at Backblaze

Backblaze has an intuitive app that automatically backs up everything on your drive, except apps and system files, making it a breeze to use. There is no storage limit and no file-size limit, and you can back up external drives, but you won't be able to back up network drives unless you go with a business plan. There are also no peer-to-peer backups.

Nevertheless, it was chosen as the best backup service by The Wirecutter and Tom's Guide, where the latter site noted:

Backblaze is excellent if you're looking for the cheapest online backup option that still offers serious file protection.

If it's a no-nonsense backup service you're looking for, Backblaze will get you there cheaper than the rest for the storage you're getting at about $50 per year.

Bottom line: For a great, no-nonsense online backup service that doesn't cost quite as much for unlimited storage, check out Backblaze.

One more thing: Backblaze has a mailing service that will ship you up to a 4TB hard drive containing your files. It costs more, but if you mail the drive back within 30 days, you'll receive a refund.

Why Backblaze is the best

This service does not handle disk images, but you can enjoy unlimited storage space for one PC with the Individual plan for about $50 a year. There's even a mailing service that lets you ship up to a 4TB hard drive containing files for storage. While it may cost a fair amount, should you mail the drive back within 30 days you'll receive a refund.

Overall, Backblaze is a solid option for those seeking a reliable and secure backup service.

Runner-up: IDrive

See at IDrive

IDrive has no limit to how many separate devices you can backup, but there is a 1TB limit to storage space. It was awarded Editors' Choice by PCMag and picked as the No. 1 pick for online backup services by Top Ten Reviews:

IDrive is the best cloud backup service because it balances exceptional value with performance and usability. This is the easiest desktop app to use in our review, and the backup and restore speeds are very fast.

IDrive uses 256-bit encryption and offers personal keys so you have sole access, and it allows for drive images to be stored. If your PC crashes, these images can be used to restore your OS.

Bottom line: For a great online backup service that also deals with drive images, check out IDrive.

One more thing: There is a free 5GB backup option available for anyone who wants to give IDrive a try.

Best Budget: SOS Online Backup

See at SOS Online Backup

SOS Online Backup is a popular option for those wanting to backup sensitive data, for good reason. Not only is it incredibly well-priced against competitors, but there's a solid list of features that keep privacy and security in mind. Lifewire positively rated SOS Online Backup:

SOS Personal is a good choice for your backup needs, especially if you're after a service that'll let you permanently back up things you plan on deleting on your computer. Just make sure you're OK with the work it might take to manually select files you want to make sure are continually backed up.

There are a few drawbacks to the service, including a cumbersome process to have files selected for automatic continuous backup and the lack of some features, like network controls and the inability to select (and deselect) files within Windows Explorer. But still, for $44.99, it's not a bad option.

Bottom line: It's an affordable yet powerful service for keeping your files securely locked away.

One more thing: Sharing files with others is a super-simple process that can be achieved through the web interface and mobile app.

Best Experience: Carbonite

See at Carbonite

Carbonite is another of the big names in the online backup space. It's priced similarly to iDrive and SOS, and offers similar features. What sets this service apart from its competitors is the ease of use, allowing even the most computer illiterate users to quickly and seamlessly back up all their sensitive data.

Cloudwards gave Carbonite a favorable review:

Carbonite Home excels in many ways that we would want a home backup service to excel. It requires little setup, backs up most file types, backs up external drives, keeps previous file versions and lets you backup as much data as you want.

The drawbacks to Carbonite include a slight increase in pricing compared to other offerings, slow transfer speeds, no monthly subscription option, and the inability to configure just how much bandwidth the app will use.

Bottom line: A great option to back up all your files without spending too much time figuring out how everything works.

One more thing: Carbonite also offers a courier recovery service: they'll send you a physical hard drive of your backup instead of having to download hundreds of gigabytes of backed up data.

Conclusion

If you'd like to deal with backing up full system images, have a look at IDrive. For unlimited storage for only about $4 a month, have a look at SOS Online Backup. If you want to the overall best online backup service, you have to go with Backblaze.

Best overall: Backblaze

See at Backblaze

Backblaze has an intuitive app that automatically backs up everything on your drive, except apps and system files, making it a breeze to use. There is no storage limit and no file-size limit, and you can back up external drives, but you won't be able to back up network drives unless you go with a business plan. There are also no peer-to-peer backups.

Nevertheless, it was chosen as the best backup service by The Wirecutter and Tom's Guide, where the latter site noted:

Backblaze is excellent if you're looking for the cheapest online backup option that still offers serious file protection.

If it's a no-nonsense backup service you're looking for, Backblaze will get you there cheaper than the rest for the storage you're getting at about $50 per year.

Bottom line: For a great, no-nonsense online backup service that doesn't cost quite as much for unlimited storage, check out Backblaze.

One more thing: Backblaze has a mailing service that will ship you up to a 4TB hard drive containing your files. It costs more, but if you mail the drive back within 30 days, you'll receive a refund.

Updated December 21, 2017: We added Carbonite as another option for backing up all your sensitive data.