Aus border security care most about weapons and biological matter; dirt, wood, bugs, plants, food etc.
Coming from Indonesia, you may be profiled vis-a-vis potential biological material but showing that you’ve taken precautions when you packed to make their jobs easier will expedite any bag search.
Unrelated but have an off-site backup! Airport baggage handling are not gentle, and your spinning rust may be DoA.
As far as ARM SBCs go, I’d say B tier. Not as good as a RaspberryPi or RockPi but armbian installed great. Had a pain debugging the rockchip video decoder in a container, and still have issues with USB hard drives.
If you’re coming from x86_64, be prepared for some unique challenges.
You can be legally compelled to give access to data in Australia, this includes decryption keys and biometrics.