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I have a new MacBook Pro 2018 model. It is using APFS but I have not enabled File Vault.

I'm backing up to a Synology NAS, just but when I run my backups, I get the message:

Time Machine is backing up an encrypted disk to an unencrypted disk

Multiple forum posts suggest that this message shows if you are using File Value and backing up to a non-encrypted drive, which I'm not doing.

I'm running macOS Mojave.

Why do I keep seeing this message and how can I stop it from appearing, as well as be sure I have good backups?

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    I'm seeing the exact same problem. Backing up my new unencrypted non-FileVaulted Mac mini (2018) to either a Synology NAS or an external USB drive, it tells me "Backup Not Encrypted - Time Machine is backing up an encrypted disk to an unencrypted disk." I suspect the message is just a Mojave bug. – Brian Kendig Nov 23 '18 at 12:57

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