I use OneDrive Personal to backup all my files to the cloud. However I have noticed some image files are being changed by OneDrive.
If I look at the version history, one minute after the upload the file is updated.
For example:
Sat at 12:38 Steve 7.06MB
Sat at 12:37 Steve 8.23MB
The file in OneDrive is now 1MB less than the original!
If I download and compare the Original file against the file in OneDrive:
file 20181225-060457-SW1-000-orig.jpg
20181225-060457-SW1-000-orig.jpg: JPEG image data, Exif standard: [TIFF image data, little-endian, direntries=15, manufacturer=Panasonic, model=DMC-LX15, orientation=upper-left, xresolution=214, yresolution=222, resolutionunit=2, software=Ver.1.0 , datetime=2018:12:25 06:04:57], baseline, precision 8, 5472x3080, components 3
file 20181225-060457-SW1-000-one.jpg
20181225-060457-SW1-000-one.jpg: JPEG image data, JFIF standard 1.01, resolution (DPI), density 180x180, segment length 16, Exif Standard: [TIFF image data, big-endian, direntries=18, description=Ayutthaya, the Ancient Capital of Thailand, manufacturer=Panasonic, model=DMC-LX15, orientation=upper-left, xresolution=294, yresolution=302, resolutionunit=2, software=Ver.1.0 , datetime=2018:12:25 06:04:57], baseline, precision 8, 5472x3080, components 3
Also it would appear the 1.2MB HD Image Prview has been pruned from the OneDrive version:
exiftool -All 20181225-060457-SW1-000-orig.jpg | egrep -i "preview|thumb"
MP Image Type : Large Thumbnail (full HD equivalent)
Preview Image : (Binary data 1232353 bytes)
No sign of it in the OneDrive version:
exiftool -a -b -W thumb-orig-%f_%t%-c.%s -preview:all 20181225-060457-SW1-000-one.jpg 0 output files created
JPEG EOI Warning = [minor] Error reading PreviewImage from file
If I look closer at the file the XMP MetaData has been altered. With some Microsoft specific attributes added to the OneDrive version:
[XMP-microsoft] LastKeywordXMP
[XMP-microsoft] LastKeywordIPTC
The upshot of this means the file I uploaded is not the same file as in OneDrive. This lack of file integrity makes OneDrive useless for me as a backup. If I were to sync OneDrive back to my laptop it would actually overwrite my originals with these newer files alterted by OneDrive.
Does anyone else see similar issues? Is there anyway of turning off OneDrive processing image files? (I have already disabled tagging and creating albumbs)
