Re: Can someone explain.....
'Offline' is a moveable feast.
Backup is a copy . Where it is and how connected it is are very variable things.
I do auto backup. If my data were corrupted the backup would be, if I didn't notice for 24 hours.
But I am protecting against hardware failure, not malware.
If I were concerned about that, I would do a check on file/backup and if the difference were massive abort and notify.
I don't consider that this particular malware is a serious threat on Linux.