2 of this weekend's jobs completed with exceptions, and mention "RWS_AttachToDLE". I get the feeling the job did in fact complete without missing data, but I would like to be 100% sure (and can't verify the backup myself right now - colleague is out of the office and the backup in question is a bit of a black box for me, it works but I am not familiar with its inner workings).

Also, how can I prevent this from happening?

Google didn't prove to be very helpful, and experts exchange seem to have changed their system so that you can't simply scroll down to see the answers to a particular question ;-)