My PC has three partitions. C (SSD) for system, D (SSD) for programs and E (HDD) for data. The system could be Windows 7 or Windows 8 or Windows 10. Now I need to backup C and D partitions in E or another external portable hard disk or a NAS. The backup can be triggered either automatically (always running in the background) or manually. Would you please recommend any software towards this purpose? I am thinking about Acronis True Image for PC. What do you think about it? Or do you have any other recommendations?