If you want to backup your important files or folders even operating system, you can choose an external hard drive or USB hard drive. In this case, you need to ask professional data recovery software for help, or you cannot access any NAS device.
However, Once power loss or machine failure appears, retrieving or recovering files or folders from the system becomes complex. Even if your computer is damaged by fire, virus or directly crashes, you still can restore your backup from NAS. To ensure the security of your data, backup to NAS drive could be your best choice. However, if your hard drive fails or computer crashes, you will lose your files or folders forever. Once you lose it, you can restore them in a short time.
If you want to backup the frequently used files or folders, you can backup to internal hard drive. When you decide to backup your computer, you need to choose a proper storage device.
