please excuse my probably stupid question:
do btc need to be moved in order to claim bcash? is there a deadline until this needs to be done or can one claim bcash let´s say in 2 years? 5 years?
nope but to move the bcash you have to expose your private keys. that would be a very stupid thing to do with an unknown wallet. anyone redeeming them should move their btc out before doing so.
assuming your btc was in the wallet on the fork date, the bcash will always be linked to those private keys.