@Gabz I'm on the 15 day BackBlaze trial. 5 days in, almost have 750 gigs of photos and lossless music backed up from external drive connected to MBA. This drive backs up my NAS. Seems like the way to go. There are (age limits)[https://help.backblaze.com/hc/en-us/articles/217665398-Backing-up-External-Hard-Drives] for external drives though so got to be sure and connect it for back up every 30 days. BackBlaze will remind you, fortunately.