Not able to Backup Settings to Cloud

I have not been able to back up my settings since December. When I select “Backup my Settings”, it seems that they are being backed up and I get a message that the backup was successful. However , when I go into “Restore From Backup”, the backup is not listed. The last successful backup was on December 13th. I deleted some older backups thinking it may be a space problem but that did not resolve the issue. Can someone tell me how to resolve this problem? Thanks.