Continuous, automatic Time Machine backups
So I sold my 1 TB Western Digital My Passport USB 2 external hard disk for dirt cheap to a student who came with 3 sketchy looking friends to pick it up.
Then I bought a 128 GB SanDisk Ultra Fit USB 3 flash drive. The thing is so tiny its almost invisible.
Now it is connected to one of the USB ports of my MacBook Pro for ever.
And Time Machine is taking regular backups to it automatically every few minutes. Backup A game!