Description of my issue:
Long time user... this is a key site hosted by SiteGround. Cron was running well, and recently started failing intermittently.
On manual backup, the backup would halt on what appeared to be time-outs, but would backup successfully (tested restore on our testing server). I ran the Configuration Wizard and now the manual backup is stable, but the command line backup is still intermittent.
A zip file of the command line log is attached.
Thanks
Theo