• IIRC, there should be a double backslash for the share names
    😎

    sqlcmd -E -S $(ESCAPE_SQUOTE(SRVR)) -d LL_DB -Q "EXECUTE [dbo].[DatabaseBackup] @databases = 'AVAILABILITY_GROUP_DATABASES', @Directory = N'\\backup\SQL\Drive1\, \\backup\SQL\Drive2\, \\backup\SQL\Drive3\, \\backup\SQL\Drive4\, \\backup\SQL\Drive5\, \\backup\SQL\Drive6\, \\backup\SQL\Drive7\, \\backup\SQL\Drive8\, \\backup\SQL\Drive9\, \\backup\SQL\Drive10\', @BackupType = 'FULL', @Verify = 'Y', @CleanupTime = 24, @checksum = 'Y', @LogToTable = 'Y'" -b