Definition
It is preferable to be cautious and take precautions to avoid potential danger or problems, even if it seems unnecessary or inconvenient.
寧可能有危險，寧可先謹慎。
I always carry an umbrella, just in case. Better safe than sorry.
我總是帶著雨傘，以防萬一。小心駛得萬年船。
Although checking twice seems like overkill, it's better safe than sorry.
雖然檢查兩次似乎有點過度，但小心駛得萬年船。
I'm going to back up all the files first, just in case. Better safe than sorry.
我要先備份所有檔案，以防萬一。小心駛得萬年船。