If you can, just like Mike said, as much as possible, but even $10 a week helps.
I save 20% per week straight into Savings, and 20% into retirement accounts every week.
Sounds like a lot, but know this- the savings account is actually lived on for 10 weeks a year when my contracts are up.
I have not given myself a raise in 9 years. Every time my income has gone up (3% usually a year), I up my savings amount. It means if I were unemployed long term, hopefully I could easily slide back into less living as I normally try to live on about 60% of what I actually make.
Best advice ever? Don't spend more than you make. Period.