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You need to create a new droplet to change the size of the disk. You can create a snapshot of your old VM and restore it to your new one to migrate your old data.
Alternatively you could mount an Amazon or DreamObjects bucket as a folder:
https://firefli.de/tutorials/s3fs-and-dreamobjects.html
You need to create a new droplet to change the size of the disk. You can create a snapshot of your old VM and restore it to your new one to migrate your old data.