Assuming you are exporting to have backup copies of your files I can suggest that Canon RAW format won't necessarily be around forever but you will likely still have software on your future computer to be able to convert to whatever format(s) come our way in the future. My own solution at this time is to back up the raw files, xmp sidecars, and the LR catalogue on a regular basis so that I can preserve the original file (in case of future improved raw converters) as well as any of my edits in LR or PS. DPP is useful, but I seldom use it at home anymore as I prefer the greater abilities of LR and PS and the fact that most of the edits are reversible, unlike DPP which changes the original raw file when saved.

Have considered TIFF and other non-lossy converted formats, but choose to archive raw format for smaller file sizes, and potentially future flexibility. Not having a crystal ball to gaze into the future I have no idea what new formats, or processing software, will come and which of the current ones will pass. Future compatability is anyone's guess.