have any suppliers cracked the problem of backing up a largish (9GB) outlook pst file to the cloud while it is in use? didn't work with google drive last time i looked 
Your struggle uploading a single file that size up to the cloud, it will probably crap out half way through and fail or want to retry from the beginning again.
If its purely for back up purposes, you could try breaking the file size into segments ie, 100mb or so then uploading, that way if it does crap out it will retry from the last failed segment, but bit of a pain as your have to recreate the file size again on download or recovery. Also remember what the Max File Upload size is for each Cloud Account ie, OneDrive is 10GB max.
Another option is to use a File Uploader that breaks the File size then reconstructs it again once in the Cloud, theres a few around but one I would recommend is Zoom Uploader, its Freeware and works really well, works on just about every Cloud Storage out there. Bit of a pain to set up for each Cloud Account but once done does its job perfectly. It also allows Pause Stop and Resumable Uploading, even between PC Reboots which is really handy for Large Files
http://z-o-o-m.eu/ or
http://z-o-o-m.eu/down.htmTip with Zoom, once youve set your Cloud Account up, go to Tools/Settings/Connection/HTTP Buffer Size = and set this to the same size or just under your ISP Upload throughput speed (in kB). This will give the fastest upload speed.
ie, Say your ISP upload speed is 5Mb, then 5 divide 8 is 625kB so set the Buffer to 512kB not 1024kB.
