As @poetaster, I clone my XA2 on another XA2 from time to time.
This way, I don’t have to reinstall every app manually.
I make an image of the source phone on a µSD and I restore it to the target phone.
The procedure is described here: Full dd backup of rootfs and /home as flashable images - #4 by ric9k
Then every week or so, I copy /home on my computer. Description here: Full dd backup of rootfs and /home as flashable images - #5 by ric9k
The above techiques are not so complicated but far from being automatic.
So, I finally use a systemd timer which makes a hourly backup on the µSD that is permanently in the phone and weekly rsync it into the PC.
EDIT: The whole-phone-cloning technique is working very well apart for Android App Support (I don’t use it so much), even with two licensed devices.
There must be a file somewhere that identifies the devices / compares with IMEI.
But where?