Using Time machine and external HD at the same time

Dear All
I'm intending to buy an external HD both for the purpose as a external HD and for time machine use.
Is this possible? If so, how do I configure it?
Thanks.
Jojos

Apple Partition Map works just fine on an external HD (including booting from a clone made with SD). GUID is only required for the internal HD on Intel-based Macs. There is a lot of misinformation going around on this topic.
Is Apple spreading the misinformation Barry? This OP originally asked about Time Machine and an external drive. He later asked about bootable backups. I tried to take all that in consideration in my reply. Apple has consistently said in everything that I have read in the Knowledge Base that when using Time Machine with an Intel Mac to use the GUID partitioning scheme.
There are also recent posts around these forums, as well as around the internet, where folks have had bootable volumes that were not GUID and they encountered strange behavior on their Macs that they report was resolved by making sure that their bootable volumes on external drives were in the GUID partitioning scheme.
Dah•veed

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