I downloaded the new operating system BigSur. Asking if i want to download all of my files in iCloud. Assuming the answer is No? Says will use 990.2MB.
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Personally I prefer not to sync my documents and desktop folder to iCloud Drive which is what you’re talking about here. The plus is that your documents and desktop items are then backed up to the cloud. That’s great. The negatives are that you it tasks your computer more than it should which means less processor power for other things. Second negative, you have to make sure you have enough space in the cloud. Apple is hoping you buy more. Third negative, it means that the Desktop and Documents folder are basically useless for major tasks like editing video or audio files with professional level programs. Those files would have to find new homes. Not applicable to your use but I like to be thorough in my answers so I thought I’d mention it.

Also, keep in mind there are competitors to iCloud Drive syncing like Google Drive, Microsoft's One Drive, and Dropbox. Dropbox being my first choice.