An update replaces the software, not your shop. Your menu, your
settings, your staff and their permissions, your order book, the
devices you've paired and your licence all carry across. That is
the rule the whole update path is built around rather than a habit:
your records are on your tablet, so an update that behaved like a
fresh install would be the end of them.
Before an update, OrderLah takes a recovery point — an ordinary
backup of what is there, checked before it's called a protection,
and listed as Before update in the same restore list you
already use. It's kept apart from your daily backups so it can't
overwrite one, and restoring it is your decision: nothing rolls
your shop back on its own while you're open.