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The system will try to retain your IP address for you automatically if you recreate a droplet using the name of the old one. Though, unfortunately, this requires destroying the old droplet first in order to release the IP address.
If you want to upgrade a droplet in-place to a plan with more RAM, you can use the “Fast-Upgrade” option. If you need to rebase it on a different OS image, you can use the “Rebuild” option though that will not retain your data.
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