How can I encrypt USB drive so that it would subsequently be readable/writable on any computer that I plug it in? For instance, it should then be possible to easily plug the encrypted USB drive on a Windows or Mac computer, and be able to access the contents without any fuss.
As for the solution to encrypt a USB drive on a cross-platform, I guess a third-party utility is the optimal option, which supports sorts of operating systems. If you plan to encrypt a USB drive on macOS and Windows, iBoysoft BitLocker for Mac is suggested here, which allows you to encrypt USB drive on a Mac without a hitch as your Windows PC supports BitLocker drive encryption.
Take care~
Guide on how to remove write protection from SD card or Micro SD card. Then you can modify data or format the write-protected SanDisk, Samsung, or Transcend SD card.
This post is an introduction to the iCloud Backup function on iPhone and iPad, including what the iCloud Backup is, how to back up iPhone/iPad with iCloud, how to restore from iCloud Backup, etc.