Hardware & software:
- Command line command: rsync at https://en.wikipedia.org/wiki/Rsync for free from Andy Ihnatko.
- DoubleTake by FiLMiC Pro at https://apps.apple.com for free from Rene Ritchie.
- Byte (iOS) at https://apps.apple.com for free from Alex Lindsay.
- Rugged AirPods Pro Case at https://hellonomad.com for $34.95 from Lori Gil.