Online storage
These would require you to manually make a copy of your data onto each of these physical devices.
While this can be a good way of backing up, there are occasions when these external devices can malfunction and data can be lost.
As a result, there is another way that you can back up information, and this is through the cloud.
Making sure your devices are backed up onto the cloud means that you can access your data from anywhere that you have access to the internet.
This is particularly useful if you want to be able to access your content from your laptop and your phone.
Some examples of these clouds are iCloud and Google Drive, and they allow you to store different kinds of data (documents, photos, music etc.) within a certain amount of storage space.
If you need to increase this storage space, you would need to pay a fee for this.