Backup not working

My Cloud OS 3 Personal & Network Attached Storage My Cloud EX4
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I bought my EX4 about a month ago and had been unable to do a NAS to USB backup sucessfully – always having the same problems reported here.  I looked through the posts for the EX2 on the other WD Community and found “Re: Problem with USB Backup - I had the same problem. After much trial-and-error I found out that SPACES in the jobname cause the problem.”  I tried backing up about 10 gigs of data without spaces in the job name and this was the first time I was able to backup successfully.  I removed the USB drive from the EX4 to verify that the files copied correctly on another machine.  They did.  I was beginning to worry that I should have purchased a Synology unit, but being able to do this backup has given me hope.  I will try a more substantial backup soon.