A lot of people back up to an extra hard drive, sitting inside or next to their home computers.
Then they think they are safe.
I have a friend whose home was burgled. They took all his home computers and backup drives. I have another friend whose home burned down while they were on vacation.
Both families lost EVERY digital image they had ever taken. We are talking tens of thousands of treasured family photos.
SOLUTION: buy TWO compact portable hard drives. Back up your important files on one then store it in a safety deposit box. Then use the second drive to do your next scheduled backup and in this way exchanging the newest backed up drive with the one in the safety deposit box. This way you don’t have to take two trips to the bank on each backup.
OR you can use web back up, if you trust some web site to handle your confidential data (I don’t)