Maybe I didn't understand the question. But there are three drives in play
1) the original (dying) drive
2) the new cool external drive
3) the newer cooler replacement drive for the computer
If you move the info from 1->2 then from 2->3 you have it made. So if you leave them on the original (dying) drive then the only thing you have to worry about is what happens to the drive after you recycle it. You don't want to leave any private data on it after you are SURE your new drive is working and all the info is over there. You want to scrub it as best you can. If there's nothing private or incriminating, or don't plan to get rid of it then no problem.
If you are talking about the data on the external drive, you want to keep that around as a backup. The new drive is new, but nothing to say its not a lemon. Get it going, keep the new drive backed up onto the external drive. In fact, if you have the option move the external drive to an offsite location (a family member who lives local, work, a friend, etc). If the other drive goes you have a backup. If the house is robbed and the computer taken you have a backup in another location.
Then pick one day a week or month (depending on how often the data changes) and do another backup.
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