TX6s Allwinner H616 - PhoenixSuit: How to use the options: Backup, Restore, Install, Reboot and Recovery?

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Hi.
PhoenixSuit: V1.10
Device: Tanix TX6s AllWinner H616
I noticed that in PhoenixSuit on the Apk tab the options: Backup, Restore, Install, Reboot, Recovery.
I tried to use to backup the current installation.
But PhoenixSuit only recognizes the device and connects with it to install the firmware.
If the file for Firmware is not selected, PhoenixSuit will not connect with the device.
Any tips?
Or another solution to back up the installation?
On the TX3 Mini I use TWRP to Backup and Restore, but is S905 Amlogic!
Tks.