I managed to back everything up a couple of days ago onto a seagate 1.5TB external HD. Then when it was doing the automatic back ups the next day I started getting roor messages. Then I realised the drive was broken - clicking loudly- and replaced it.
The new drive seems ok but it won't even do the initial back up even though the drive has been formatted. It keeps telling me it has failed. Has this happened to anyone else? Ad astra per aspera
The issue backing up coincided with firefox corrupting which froze the mac up for ages each time I tried to run it but that has been deleted and reinstalled. I don't know if that was just a coincidence. Ad astra per aspera