2 questions:
Is there a way to test if the Time Machine backup is even working? (without having a second laptop or doing a full restore to my only MBP?)
Does TimeMachine continue encrypting after my screen goes blank?
Install macOS in a virtual machine (can use 30 day trial version of VMware Fusion or Fusion Pro.) Then, connect external drive for TM use to the VM, and test away.
I have a test running right now in my MacOS 10.13.3 VM. I attached a 500GB USB3 drive I had laying around to my VM running in my MacBook Pro, used Disk Utility to erase it and format it as MacOS Extended (Journaled, Encrypted), and then setup Time Machine to use it, and to encrypt the backups.
My backup size for my test is 27.51GB, and it started 9 minutes ago. It has so far backed up 4.59GB, and is estimating that there is about 44 minutes remaining (I don’t give a lot of weight to those time estimates though. They tend to jump around all over the place.)
When it’s done, I’ll wipe the external drive again, format as MacOS Extended (Journaled) and then tell TM to use it and to not encrypt. Once that backup is done, I will change TM option to tell it to encrypt, and then see what happens.
5.16GB backed up now.
———————
1st backup complete.
- MacOS Extended (Journaled, Encrypted) + TM-Encrypted
54 minutes to complete 27.51GB to a 5400 RPM 2.5” drive in a third-party (Vantec) USB3 enclosure.
———————
2nd backup in progress
- MacOS Extended (Journaled) + TM-unencrypted
4.44GB backed up with “about 36 minutes remaining”, so encryption doesn’t appear to be making much diff at this point.
Note: Unless I can find a way to list a completion time for individual backups, I’ll probably have to restart this one, because in half an hour I have to leave for a couple hours, and the backup will probably still be going when I head out.