Quick question about backing up my Mac

I recently switched over to a Mac for school and I am loving it so far. However, I noticed there is no real "Back-Up" function. However, while browsing through my preferences one day, I came across Time Machine. Does it work similar to backing up on a Windows PC? All I want it to plug in my external HD and to back up like every month or so, so that I can restore my PC to the previous settings if something goes wrong. Just something similar to a "system restore".
Will Time Machine do that for me? It seems like more of something that you would keep your hard drive plugged in forever and it would just back up every once in a while, but I don't want to have it plugged in all the time.
Also, this is kind of off topic, but is there anything similar to CCleaner for a Mac? Thanks!

Hi there
Yes, Time Machine will create a full system backup of your Mac that is restorable.
Time Machine is made to backup:
Hourly for the past 24 hours
Daily for the past month
Weekly for the previous months
Older backups are deleted when the backup volume becomes full.
If you would prefer to do only monthly backups then you may do so, however, Time Machine may produce an error from time to time, saying that it was unable to complete the backup.
And in answer to your other question, there is an app called CleanMyMac, or there is an AppleScript/Automator App called Maintainence 3.8 (there are many others though)

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