I have the client installed on my MBP. I synced some files by dragging them into the dropbox folder. Now the dropbox folder has folders 😉 in it, can i delete those folders? Would the files still be backed up in dropbox?
No. Dropbox is not meant to be a backup solution. Your account syncs with its folder on your system(s) and vice-versa, any changes (like deleting a file) to one will be reflected on the other(s). However, you can recover deleted files via the website, but only for up to 30 days after deletion.
I have the client installed on my MBP. I synced some files by dragging them into the dropbox folder. Now the dropbox folder has folders 😉 in it, can i delete those folders? Would the files still be backed up in dropbox?
Dropbox is a place on your Mac to store documents etc. just like anywhere else, except that everything in there will be synced to the Dropbox server and any other devices linked to the same Dropbox account. So, if you now have documents etc. within the Dropbox folder, they don't need to exist elsewhere on that Mac.
Think of your Dropbox folder as an alternative combined Documents / Pictures/ Movies folder.
As Jolly Jimmy said, the files within the Dropbox folder are also protected by a versioning system on the Dropbox server.
If you use a utility like Time Machine, Carbon Copy Cloner or Super Duper to back up your local machine, then it will make a further copy of your Dropbox folder too.