TM: When external hard drive space runs out, can I add another drive?

I am using an external hard drive 1TB to back-up my new iMac with TM. When the external drive space runs out, do I have to buy another drive with much more space (e.g. 2-3TB) and start over, or can I just add a second external hard drive 1TB (will TM recognize the second one as an addition)?
Thanks for any help.

First off you should know that when Time Machine runs out of space on an external drive, it deletes the oldest backup you have. So if you are running out of space you probably don't need to worry as Time Machine will handle it. Just make sure the Time Machine backup drive has a higher capacity than the amount of data you have on your internal drive and you'll be fine. However, if you'd like to keep a lot of backups over a period of time you may want to consider getting a whole new drive. The only way you can add more drives to back up to is by using RAID 0 which I wouldn't recommend unless you have to due to the fact that you'd be more likely to lose data. The easiest option would be to buy a 2TB drive and use it with Time Machine.

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