You can easily download a copy of all of your Files and databases by opening Websites → Manage, searching for Backups on the sidebar and clicking on it:
For files, select Files backups:
Specify a preferred date and click on Next step:
Next, click on Download all files:
Give it a few minutes and the link will be ready, just click on Download backup:
That's it! The downloaded archive will contain all of your account's files 😊
A similar process applies when downloading generated Databases. Click on Database backups, select your preferred database from the list and the date, then click on Download:
NOTES
Keep in mind that the bigger backup you are preparing, the more time it will take to be ready
If the download button doesn't work for you, try right-clicking on it and opening it in a new tab