Yes you can do it without computer.
1) Upgrade to latest firmware.
2) Prepare USB power bank with two outlet
3) Powerer your USB drive and ND2901 by the USB power bank separatly.
--> ND2901 can accpet USB cable power from USB power bank
4) Connect CFast card reader to USB host port of ND2901
5) or connect your USB SSD drive to USB host port of ND2901