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When backing up or replicating VMs containing previous snapshots, no matter the number. (c)XSIBackup-DC will backup all snapshot files present in the VM folder. This will be done OK, so you are safe in regards to the integrity of the files. Nonetheless the latest .vmsd file will be saved, and this .vmsd file will contain information up to and including the last snapshot in the chain, which is the backup snapshot. Thus, the VM will many times run as it is, but you would need to manually fix the .vmsd file, deleting the last snapshot and decreasing the snapshot counter one unit to be able to consolidate and delete the snapshots in the target or restored VM.
We will fix this issue in version 220.127.116.11