Migrate Your Files to OneDrive Easily with Known Folder Move

Hmm, over 150 comments on this blog article alone. Shows there are lots of questions about the new feature. I know this isn't necessarily the right place to ask but I don't tend to get very high quality answers from answers.microsoft.com - take from that what you want :-)

So forgive me from high jacking the article.

Does OneDrive do something "weird" with Office files, like maybe recompress them? The reason I ask is that I've been using OneDrive sync to migrate an entire SharePoint document library from one library to another. I'm using our good old friend robocopy. What I noticed is that upon re-running the same command, that all of the Office documents copied again because robocopy detected them as "changed". Changed files in robocopy are those with the same timestamp but differing sizes. This is a pretty unusual situation - it's unusual for a file to change size without the timestamp also changing.

Upon digging deeper, it transpired that the file size of Office documents changes when added to OneDrive! Typically it ends up a bit bigger. It's really nothing to do with robocopy - just that this tool shows why the document was being copied. Occurs with Copy-Item as well. Copy a file from a (say) a network drive and look at the size in OneDrive and it's different.

Other file types (like PNG) aren't effected so when you run a robocopy /mir operation, they aren't changed.

If you exit OneDrive and copy the file, it's the right size. Start OneDrive again and it first uploads the document and then mysteriously downloads it again. It's in this download that the file size changes.

Apologies once again for going off-topic. A general observation - I often feel, as a pretty experienced IT support person, that getting a quality discussion at the right level with Microsoft is difficult. Is there a better forum to discuss OneDrive? TechNet seems to be pretty dead OneDrive wise.