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Once upon a time I encrypted my Time Machine and I cannot remember the password I used to encrypt it (yes, very frustrating).

I wiped my Time Machine using Disk Utility, thinking I could just start again, but now it won't let me do anything. I've attached a screenshot of what I see below. I can't seem to use my external hard drive as a Time Machine now. How can I get it back to normal so I can start backing up again? Thanksenter image description here

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