How to stop automatically backup on my external hard disk

Hi,
I have a macbook air. The first time I plug in my external hard drive (my external HD has many data from another Windows PC). Mac ask me whether I want to use this external HD for backup. Actually, I just wanna use it for data transfer but I accidentally say "yes". So, Mac delete all of my files from my external HD and start to create the backup file.
My questions are
1. How do I let Mac stop backup the file to my external HD
2. I loose all data from my external HD. There are about 200 GB. I heard that there are some data recovery softwares. Can you recommend me whether there is a free software which will works on this issue?
Please help me. Thank you very much.
Pat

Thank you so much BDAqua. I turn the Time machine off now.
About the format type, Macbook automatically did it. I guess format type is Mac OS Extended. I tried to connect this external HD to Windows PC but the PC cannot recognize it. So, I cannot recover from PC where I have recovery software. Do you have any idea how to let PC recognize this external HD?
I try to find the way but it seems I have to reconnect the HD back to Mac and try to recover on Mac. Is that only way? Do you have any suggestion? Thanks again.
Pat

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