While each piece of unwanted software that tries to get on your Mac is slightly different, there are some general steps you can take to check for and remove malware. The LaunchAgents and LaunchDaemons folders are usual locations to check. You should also look for unwanted browser extensions and do an audit of the files in your Applications folder.
Here’s why Time Machine won’t work with your external drive
Mac users relying on Time Machine went through a rough transition a few years ago when Apple migrated away from its...