OK, looks good.
1. With the W10 and storage drive connected, . Boot.
2. Create a manual Restore Point.
3. Start Macrium Reflect, > check for and install update if available.
4. In the left menu > select, image selected disk on this computer.
5. In the window that opens,. tick the W10 drive (C:??) and all partitions will be ticked.
6. In the lower, Destination, > select Folder radio button.
7. In the destination window, > click the 3 dots and browse to, and select the the storage drive > at the bottom left, > click make new folder, > name it, Macrium Reflect Images, . press Enter, > click OK.
8. Confirm that the destination drive and folder is correct > at the bottom > click Next.
9. In the EDIT window that opens, under 3. > change the Full, keep, backups . to 5. . at the bottom > click Next.
10 A summery window will open, > click finish.
11 In the save option window that opens, > name the backup Windows 10 original. > click OK.
The backup will run, take about 10 minutes. Close the windows when complete.