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#11
All the experts say to only connect your external drives when you are doing backups. That is to protect them from power surges, computer viruses, etc.
I did that for several years. Unfortunately, I only occasionally remembered to make backups. Then one day one of my hard drives with important data failed. The backups for this drive were over six months old so I lost a lot of data.
I decided I wasn't going to let that happen again. My solution was to start making automatic backups after midnight. The only way this was going to work was to leave the external drives hooked up all the time. Important data is backed up once a day. All drives are backed up once a week.
Note the computers when not being used go to sleep. The backup program wakes the computers for backups. When the backups are done the computers go back to sleep.