備える

1. Origins, structure, and basic meaning

• Structure: 備える, read そなえる, is a verb used both for being equipped with something and for preparing for a possible future event.
• Basic usage: An existing feature appears in 休憩室を備える, while a contingency appears in 停電に備える.

2. Common pitfalls and similar expressions

• を for an equipped feature
  • The object of を備える is a facility or function already provided as part of something.
• に for a contingency
  • The target of に備える is an event or danger for which preparations are made in advance.