Does opening an account that deducts a portion of the profit to cover potential losses at Al Baraka Bank render the transaction an unlawful Mudarabah, and what is the ruling on the profits provided in this case?

It is permissible to deal with banks that adhere to Sharia-compliant Mudarabah (profit-sharing) principles, and their profits are lawful. There is no objection to deducting a portion of the profits to cover potential losses if this was stipulated from the outset or agreed upon later. This does not fall under guaranteeing the capital, which would invalidate the Mudarabah contract.