Use of dropbox as a backup

THANK YOU all for your replays!!

so I moved the database out of dropbox J.

Q.1 - I understand that dropbox does not considered to be a good backup… what will be the best way to do that? as I also understand from your answers that using the sync option in DT is not the “best” idea…

Q.2 - after using sync to store DT database in dropbox… it’s seems that I can’t search dropbox any more for a specific file using the dropbox iPhone app. (it’s worked before I moved the database out)

Q.3 - I also install the DT iPhone app, just to find out that it can’t actually access DT database via dropbox… is that mean that I need to download all my over 35G DT database to my iPhone ?? is there a better way to to that ?

Thanks