Since my iPhone holds more than my iCloud account allows, is there a way to Backup to my Personal Cloud Device so that I can restore while at the Store getting my next device ?
I have a 2 TB Cloud Storage NAS set up at Home, which I can reach via Internet .
iPhone 6, iOS 9.0.2
No.
Either spend a couple dollars and buy more iCloud space or backup locally using iTunes from your computer.
It is not a case of cost, but since you started the response, it is a case of TRUST of iCloud. I would backup to iCloud before I leave home, then by the time I got to the store, not sure how many people will have had access to this public cloud. I will prefer to use a Private cloud, with encryption and strong password authentication that I can really trust. Just my paranoia.
I will continue to investigate trusted 3rd party packages and other apple solutions, and Since I spent a lot more than a couple of dollars to have this solution, I am not afraid of costs.
Even if you can backup to your personal cloud, you will not be able to restore the backup from anywhere but iCloud or iTunes. That is the way Apple designed it to work. All iCloud backups are encrypted.
Back up tp Personal Cloud
