Use 'provide against' when discussing planning for situations that are not likely, but possible. By saving money regularly, you provide against future financial difficulties.
Pro Tip 2/3
Proactive Measures
'Provide against' implies action before a potential problem occurs, not after. Vaccinations help to provide against the spread of infectious diseases.
Pro Tip 3/3
Not Always Physical
'Provide against' can refer to non-physical preparations, like financial or legal ones. Her will provided against any disputes over her estate.