I didn't look for any indication as to why it failed. I do now know the reason. Just before the back-up, my son gave me half a dozen movies which I put on my desk top. Never thought nothing more but those movies put my HD over the capacity of the back-up HD by (4) gb. So you are right about there being insufficient space.

jaybass


OS 13.6.6 iMac (Retina 5K, 27", 2017, 3.4 GHz Intel Core i5, 24 GB RAM, 2400 MHz DDR4. SuperDuper. 1 TB Lacie HD