Yes, there is no more information to add
It is optional
Sometimes, but rarely.
There were weekend staff
Yes, if maditory or the company needs help and it cause you to work the weekend or the job cause for you to work weekend
I was on call two weeks a month, which included nights / weekends. That said, it was somewhat uncommon to have to work more than a few minutes on a weekend, if at all.
No, I do not work weekends. However, there are many positions that do require weekend hours.
I did, we would sort statement checks back in those days.