Retrospect supports backing up OneDrive files but only if the files have been downloaded and saved locally. OneDrive offers flexibility in terms of letting users determine what files/folders they want to be saved locally. Under the OneDrive settings, expand Advanced settings and by clicking on "Download all files" will allow Retrospect to back up all the files on the OneDrive folder.

Alternatively, you can go to the OneDrive folder by opening the File Explorer, navigate to the OneDrive folder, and for the folders/files that you want Retrospect to back up, right-click and select "Always keep on this device".

To see what files are being saved locally vs. only being in the cloud, navigate to your OneDrive folder and look at the Status column. If the icon has a green check mark, that means it is saved locally and Retrospect can back it up. A cloud icon means it is only saved in the cloud and will not be backed up.

When using Retrospect to perform a Bare Metal Restore (BMR), if some or all the files exist only in cloud, those files will not be restored. OneDrive will believe they have been deleted, but after logging into OneDrive on your restored system, you will receive a notification about those files being deleted. You can then click on "Open OneDrive Recyle Bin" and restore the files.