Norton Online Backup Error W64

When my Norton Online Backup was doing it's routine backup it first came up with error A2211 on two different occasions. When it did it's next attempt to backup for today it got through all the files, but the backup failed and said Error W64. I haven't been able to find anything about this error code. I am not sure what I should do.

When my Norton Online Backup was doing it's routine backup it first came up with error A2211 on two different occasions. When it did it's next attempt to backup for today it got through all the files, but the backup failed and said Error W64. I haven't been able to find anything about this error code. I am not sure what I should do.