re: Goal for retirement savings as a ratio of salary

Multiples of.income arent very useful. You could be spending 95% of income or 50% those would require entirely different retirement savings to replace.

A better rule of thumb is a multiple of projected retirement expenses minus retirement income sources (SS, pension etc). For a 4% safe withdrawal rate you'd use 25 x (expenses - retirement income)

Thus you'd need $1m for every $40k remaining expenses. More if the withdrawals are taxed.