Hi Adewale,
Welcome to our community! 
I’m not sure if I understood your problem correctly but please do not install Unity or Unity Hub on an SD card. Also do not have your working project on an SD card. The access to the SD card is way too slow.
However, you may use the SD card as a store for your backup. If you duplicate your project folder, you save the duplicated folder on the SD card. Moving the working project folder back and forth is not recommended because you could lose data.
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