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This is quite complicated to implement, because Domino Backup is an integration solution.
Even for a standard file copy operation the resulting disk could be a ZFS disk or any other dedupluciating solution.
In that case you might not need the full space for a new backup.
Here are two approaches which could work and would not be too complicated to implement.
1. Stop backup and fail remaining databases if the same error message would occur more than a configurable threshold. Similar to what the replicator does.
2. Have an integration point to check if sufficient space is available.
Or alternatively let the pre-backup command result and fail the backup if this fails.
Currently the result is logged but the backup is not failed.
-- Daniel