Storing PDFS on Cloud

Hi! I am currently trying to set up a workflow with Zotero. I want to download pdfs with Zotero in order to extract citations and to take limited notes, but I don't have storage space on my hard drive to save PDFS there permanently. I have been reading that saving Zotero data on cloud drives can be risky, is this true for PDFS that have been annotated in Zotero as well? Thanks for your help!
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