When you check the status of your sync https://www.cloudhq.net/synch_events, you will see different stages. One of them is the process of cataloging metadata.
If there are a large amount of files that have been already transferred using some other method, then cloudHQ needs to catalog them.
Sadly, cataloging is a very extensive operation (2x to 3x times more extensive than sync at which point you may think nothing is happening from the front end) —
this is because we are a syncing service, and we need to ensure consistency.
To explain this in detail, when cloudHQ runs into two files with have the same filenames, but they are not in our database (they were copied via some other means), cloudHQ needs to download both files and compare them.
If they are indeed the same, we need to do additional checking to see whether some other system is copying in parallel with cloudHQ. This check is to prevent corruption of your data.
This is a very similar process to when you install Dropbox on a computer that already has a Dropbox folder with a lot of files matching the files on Dropbox’s servers.
Please be patient and wait for cloudHQ to catalog and transfer all files from all of your cloud accounts so it can start syncing while ensuring consistency.