Apoyar vs. respaldar
While both apoyar and respaldar can be translated as to support, they are not always interchangeable. Apoyar is a more general and common term for all kinds of support, while respaldar implies a stronger, more formal, or defensive type of backing, akin to 'having someone's back'.
Apoyar
A2Apoyar is a very broad and versatile word for support. It can refer to physical support (to lean or rest something on another), emotional support (to be there for someone), or general backing for a person, idea, or project, often through active participation or encouragement.
Apoya la escalera contra la pared con cuidado.
(Lean the ladder against the wall carefully.)
Mis padres siempre me van a apoyar en mis decisiones.
(My parents are always going to support me in my decisions.)
Mucha gente salió a la calle para apoyar la huelga.
(Many people took to the streets to support the strike.)
Me apoyé en el hombro de mi amigo porque estaba muy triste.
(I leaned on my friend's shoulder because I was very sad.)
La fundación apoya a jóvenes artistas con becas.
(The foundation supports young artists with scholarships.)
Respaldar
B2Respaldar comes from the word espalda (back) and literally means 'to have someone's back'. It signifies a stronger, more official form of support. It is used when providing a guarantee, authority, evidence, or a safety net. It means to back up, endorse, or vouch for something or someone.
El presidente respaldó públicamente las acciones del ministro.
(The president publicly endorsed the minister's actions.)
Necesitas un estudio científico para respaldar tu teoría.
(You need a scientific study to back up your theory.)
El banco necesita una garantía para respaldar un préstamo tan grande.
(The bank needs a guarantee to back such a large loan.)
No olvides respaldar todos tus archivos importantes en un disco externo.
(Don't forget to back up all your important files on an external drive.)
Si tienes problemas, sabes que todo el equipo te va a respaldar.
(If you have problems, you know the whole team will have your back.)
Summary
In essence, apoyar is about general support, which can be emotional, physical, or ideological (like helping or cheering). Respaldar is about providing a solid guarantee, security, or official endorsement (like backing up a claim with data or a bank backing a loan). You apoyas your favorite team by going to the games; the sponsors respaldan the team with money and contracts.