Will I lose my files if I downgrade?

No, upgrading or downgrading a Business subscription will not remove any files from your account.

Thank you for that, much appreciated. But all the current files will still be alright?

Yep, nothing happens to those files!

Thank you so very much for your reply & your time.

Hello i have dropbox basic and i tried dropbox business trial and uploaded files more than 10gb and when i'm going to cancel trial what happens to those files ?
are they going to delete them or it's just i can't upload new files but keep those 10gb froever ?

Hey omendra9, I’ve moved your post under this discussion, just so as to ping you to the hints posted here previously. While these pointers should address your initial questions, please let us know if you have any follow-up inquiries or observations. Thanks & have a wonderful week ahead until we talk again! 

hi everyone i would like to ask a question is this safe to store website backup on google dropbox, i just want to create backup of my website moralusa and want save it on ?

Good morning.
If you downgrade the plan, you will not lose any files you have uploaded previously.
However, please note that we cannot upload additionally.