Clarify encryption section: It's not just for cron users.

docs/how-to/set-up-backups.md

@@ -135,9 +135,8 @@ configuration](https://torsion.org/borgmatic/docs/how-to/upgrade/#upgrading-your
 
 ### Encryption
 
-Note that if you plan to run borgmatic on a schedule with cron, and you
-encrypt your Borg repository with a passphrase instead of a key file, you'll
-either need to set the borgmatic `encryption_passphrase` configuration
+If you encrypt your Borg repository with a passphrase instead of a key file,
+you'll either need to set the borgmatic `encryption_passphrase` configuration
 variable or set the `BORG_PASSPHRASE` environment variable. See the
 [repository encryption
 section](https://borgbackup.readthedocs.io/en/stable/quickstart.html#repository-encryption)