I'm having this issue too,
until last night, I was able to backup my files using the scheduled backup in the desktop app.
this night, the backup failed in the middle and this is what I error logs show:
--------- start error log --------
[Total retry attempts : 24]
[Start Time: 03/10/2016 03:58:32]
[End Time: 03/10/2016 07:53:52]
[Files considered for backup: 110623]
[Files already present in your account: 7416]
[Files backed up now: 721, Size: 3.63 GB]
[Unable to continue the backup operation.
Reason : Possible reasons:
1. Ensure that you do not have an intermittent Internet connection.
2. Check if you have granted the necessary privileges on local firewall settings for it to run correctly.]
--------- end error log --------
now the backup fails right on the start so I can't backup or restore any of my files with the desktop app.
furthermore and more worrisome, I opened idrive's site and tried to login to my account online, via web, using my browser and after entering my login username and password got this error:
"There was some problem, please try later."
so I can't access my account either via web or via the desktop app...
this is scary...
members, please replay if you are having this issue too