Okay to boot TWRP temporarily?

KJU

Hello.
Ubuntu Touch is running nicely on Pixel 3a XL bonito.
Many thanks for that.

In order to make a full backup and store it off-device, can I safely boot TWRP over a USB connection with:

'fastboot boot twrp.img'
and only use the backup function
... then reboot UBTouch without installing TWRP?
And, would the backup be TWRP-restorable?

I have faith that somebody knows!
Cheers,
KJU

KJU

@KJU
Hello,
TWRP, it seems, doesn't boot temporarily with my Ubuntu Touch bonito device in fastboot mode.