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Question: Can't turn on encryption on existing Time Machine backup

When I try to turn on encryption on an existing unencrypted Time Machine Backup — following Apple's instructions — I get the following error:


There was an error preparing the Time Machine backup disk “Time Machine”.

POSIX reports: The operation couldn’t be completed. Invalid argument.


Specifications:


  • MacBook Pro (13-inch, mid 2012), 16 GB memory.
  • macOS 10.13.1
  • MacBook Pro storage is an SSD formated as: APFS (Encrypted).
  • backup is over USB 3.0 to an external 2.5" HDD.
  • external HDD backup drive is formated as: Mac OS Extended (Journaled).


Any suggestion what I could try, in order to turn my working, existing and unencrypted Time Machine backup into an encrypted Time Machine backup?


Thanks

MacBook Pro, macOS High Sierra (10.13.1)

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Question: Can't turn on encryption on existing Time Machine backup