Save showfile to multiple paths with one command

I'd like a setting in shell or setup that allows me to specify multiple save targets, then a keystroke that simultaneously saves a version of my showfile to multiple targets (ie, on an Ion to specify to save it to the regular showfile archive and simultaneously to some specific path on an installed USB stick, or on nomad the ability to save to regular showfile archive + the mini USB I keep permanently in the machine as a hail Mary backup + the regular USB I use to transfer files back and forth from the nomad to my laptop/email/etc).  On a QWERTY keyboard it could be CTRL + SHIFT + U (a modification of the SHIFT + U which currently saves the showfile into the regular archive.