I’ve had similar worries, especially when figuring out how to move files from one dropbox account to another without exposing anything along the way. What helped calm my nerves was checking out a solution from
https://mac.eltima.com/transfer-file...pbox-accounts/ . It let me handle both accounts through one interface and keep everything encrypted locally before transferring. That client-side encryption piece was the main reason I switched — it gave me more confidence that nothing leaves my machine unprotected. Definitely worth looking into if you want both security and convenience.