Yorkshirekid:

 

I'm looking for some arguments FOR keeping data in the office instead of in the cloud.

 

speed, speed, speed and speed
And some cloud providers throttle LARGE data transfers to the point of it being crippling (everyday use wont be affected)
Full restores might take a day longer (might)

Depending on whats moved to the cloud  ....
You may be more reliant on IT support . For some companies thats an issue , they dont want to spend $ on IT support until things break .
So factor in a support contract from both the cloud provider & local IT support .
If you change IT support some time after they set all this up , they may play hard ball and make things very difficult (I know of that happening)

It may not be just 'data'
You may need to have a Cloud hosted server & move all your server based apps/software into the cloud (eg if running SQL based apps )
You may need to ~move~ all the workstations into the same cloud service .

Data in the cloud will still need a separate backup , dont assume the Cloud provider will backup your data .