Recently Dropbox Platform has moved to API V2, thus our Backup & Restore plugin has been also updated to be compatible with Dropbox new version.
We’d recommend to update the plugin to the latest version and reconnect Dropbox Full Backup to Dropbox to let it work with the API V2.
Please follow the steps below to reconnect to Dropbox correctly:
1. Login at your WordPress website dashboard –> Dropbox Full Backup –> Settings –> Connect to Dropbox
2. Sign in to your Dropbox account –> Allow access to it
3. Copy the code–> enter it in plugin Settings box–> hit Get Access token
4. Once you are connected, you will see your backups in plugin main window and will be able to backup your website content
P.S. If it did not help, try to reinstall the plugin.