There are a few reasons why Time Machine may not back up your data.
First, make sure that your backup drive is formatted as Mac OS Extended (Journaled) and that it’s connected to your Mac.
If your backup drive is full, Time Machine will not back up any new data. To make more room, you can delete old backups or move them to another drive.
If your Mac is turned off or not connected to the backup drive, Time Machine …
