I bought a Seagate 1tb Backup Plus Portable Hard Drive today, and after setting it up, and letting it do it's thing, i realized that if i leave it plugged in, it will continue to make backup every hour or so. Is there any way to set up "time machine" to make a backup once a week, if i leave the hard drive plugged in? I guess that i could just unplug the hard drive, and plug it back in whenever. Is that my only option? Thanks.