It sounds useful, but how much space does each snapshot take? The same as the whole installation?
If you use btrfs:
All 50 snapshots together will take up about as much space as all the files you have deleted in the meantime.
If you also use btrfs compression, you will probably have more space than you have right now.
You can find good Information about Btrfs in the wiki
It’s not magic, even if it sounds like it now 
For the record the first action to fix this problem was
Resetting all the keys
Remove or reset all the keys installed in your system by removing the /etc/pacman.d/gnupg directory (as root) and by rerunning pacman-key --init followed by pacman-key --populate to re-add the default keys.
Then it was
pamac install jdk-openjdk --no-upgrade; pamac update --no-aur
Although I did have to use
pacman -Sy jdk-openjdk
on one of the two computers instead.
Then it all updated nicely!
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