Time machine backups of external drives?

[gangof4]

I am using Time Machine to backup my internal imac drive hourly. I have a Lacie external drive on which it backs-up and then another external drive with data. While TM backs-up the internal hard drive, does it automatically back up the data on the second external hard drive?

 

[gentlefury]

I am using Time Machine to backup my internal imac drive hourly. I have a Lacie external drive on which it backs-up and then another external drive with data. While TM backs-up the internal hard drive, does it automatically back up the data on the second external hard drive?

Time machine will, by default ignore all drives that isn't the MacHD disk. You can go into the prefs and add your other drives and it will then back them up too.