For most of the time, I prefer local backup, store my things to external HDD. I have a backup tool called Aomei Backupper(http://www.backup-utility.com/), a freeware, support partition backup/clone, disk backup/clone and system backup. Backup to NAS, I
like it because it is totally free.
Well, I also use cloud backup. Usually backup files.
I prefer HDD because it is not expensive than SSD.
I think Schedule Backup is important.
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