I want to move the backup sets to another drive because I want to resize the drive but I don't know if I'm doing it right.
I have first launched a duplicate job to move all copy sets to a local drive. With this is enough? Or do I have to copy something manually?
When the duplication job is finished, do I have to delete something from the appliance itself?
You should just duplicate the backup sets to your new drive. Do not copy them. After the duplication, if you want to recover the space on your old drive, expire the backup sets on your old drive.