I was trying to back up volumes created in Ceph using *rbd export* and *rbd import*. For incremental backups, I used *rbd export-diff*. I was able to take the full backup using *rbd export*, but when I tried to import the incremental backup using *rbd import-diff*, I encountered an error: Steps I followed to take the backup: # cd volume-ee6f1396-7082-4475-bc0e-d7005b3331db/ # rbd snap create volumes/volume-ee6f1396-7082-4475-bc0e-d7005b3331db@snap1-$(date +%Y%m%dT%H%M) # rbd export volumes/volume-ee6f1396-7082-4475-bc0e-d7005b3331db@snap1-20250820T1227 snap1-20250820T1227.rbd2 --export-format --------- Write data in to the volume # rbd snap create volumes/volume-ee6f1396-7082-4475-bc0e-d7005b3331db@snap2-$(date +%Y%m%dT%H%M) # rbd snap ls volumes/volume-ee6f1396-7082-4475-bc0e-d7005b3331db SNAPID NAME SIZE PROTECTED TIMESTAMP 202 snap1-20250820T1227 1 GiB Wed Aug 20 12:27:16 2025 203 snap2-20250820T1231 1 GiB Wed Aug 20 12:31:08 2025 # rbd export-diff volumes/volume-ee6f1396-7082-4475-bc0e-d7005b3331db@snap2-20250820T1231 --from-snap snap1-20250820T1227 snap2-20250820T1231.rbdiff # ls -lh total 782M -rw-r--r-- 1 adminuser adminuser 600M Aug 20 12:30 snap1-20250820T1227.rbd2 -rw-r--r-- 1 adminuser adminuser 182M Aug 20 12:37 snap2-20250820T1231.rbdiff # rbd import snap1-20250820T1227.rbd2 volumes/vm1 Importing image: 100% complete...done. # rbd import-diff snap2-20250820T1231.rbdiff volumes/vm1 start snapshot 'snap1-20250820T1227' does not exist in the image, aborting Importing image diff: 0% complete...failed. rbd: import-diff failed: (22) Invalid argument Thanks and Regards Vishnu Bhaskar Acceleron Labs Pvt Ltd Bangalore, India