That's fantastic, thank you for replying so quickly. I wish you guys all the support with the future of Clouddrive. I really hope that Amazon starts working with you better instead of putting up barriers.
The ideal way is to detach the drive. But if you have a lot of data to upload, that isn't going to work, really.
We don't have an outright "pause" button to do this. It's something that's been requested, and that we will probably add.
In the meanwhile, open up the UI, and go to the ACD drive. Click on "Drive Options" -> Performance -> I/O Performance.
This will open up a window. Set the upload threads to "0", and this will stop it from uploading. You'll need to set this back once you're back up and running.
Also, data corruption won't occur regardless. Data is not purged from the cache until we have verified that it's been uploaded.