Table update: restore or replace?

[Rich Shepard <rshepard@xxxxxxxxxxxxxxx>]

I just updated a column in a table (postgresql-10.5) and accidently applied
it to all 185 rows rather than just one. There is no active transaction to
roll back.

Each night I do a backup and just started working on the database a few
minutes ago. If I restore all contents of
/var/lib/pgsql/10/data/ will this restore the database's state before the
botched update and two previous updates today?

Rich