If your Mac is using a Time Machine backup drive, but the backups aren’t completing or seem to be stalled, there are a few things you can do to troubleshoot.
First, make sure that your backup drive is formatted as Mac OS Extended (Journaled) and that it’s big enough to store all of your data. You can check the size of your backup drive by selecting it in the Finder and choosing Get Info from the File menu.
If your …