I have 1-1.5GB size wordpress files on my hosting server. Last time WordPress Backup to Dropbox successfully backed up all my files to my dropbox account (it took 8 hours). I have 50GB space on dropbox account and there's 48% free space. Now this plug-in not perform schedule backup and manual backup. What is the reason? If i uninstall and re-install plug-in not working. Any solution?