Perhaps you should post this into the main Q&A, anyway if I remember correctly to back up you really need E-Designer, however, there is a way. power down the HMI, select dip switch 1 to on (I think) then re-boot, it will come up with a screen allowing upload/download from memory card. The card needs to be configured with directories & must be FAT32. I have never uploaded only downloaded so don't know if you can, the file will be a dat file so cannot be edited. the best way (assuming no password) is to use E-designer to upload the project then you can export it to a DAT file & put it onto a flash or USB card.
If I remember correctly, if you plug a clean card into the HMI & wait for a while it will configure the directories for you.