And whats more, Dropbox can be installed on PC to sync your files to the cloud.
Its syncing ability is simply something that a USB drive cannot beat.
All of them, including Dropbox for Windows, are free.

The storage is only 2 GB, however, for the free plan.
It is much less than that of Google Drive which generously offer up to 15 GB.
Even the free plan of OneDrive that has been downgraded by Microsoft still give 5 GB for every one.

Despite the shortcoming, Dropbox is still a popular choice, especially among professionals.
The way it sync your files depends on the subscription plan that you choose.
The basic plan, which is free, uses the space in your hard drive.
The file doesnt take up space in your hard drive because it is only a placeholder.
Such a syncing method is called Smart Sync.
With that price you will also get a 2 TB storage.
For free users, dont fret.
Dropbox Paper, document scanning, and Dropbox Transfer are a few among the features available at no cost.