The TLG file is only useful as long as there is a recent good backup set from the same company data file that it can be paired with.
The TLG file contains the actions/activity that has occurred since the last full backup (with complete verification) has been made.
Let’s say you have a current damaged file called “My File.QBW” that has transactions from 01/07/2010 to 30/11/2016 that cannot be opened at all and is unrecoverable.
Yet you have its corresponding TLG file “My File.QBW.TLG” available.
Also, assume that you have multiple backup sets.
“My File (backup 30062016, 1230pm).QBB”
“My File (backup 30092016, 1245pm).QBB”
“My File (backup 31102016, 1250pm).QBB”
The current TLG file “My File.QBW.TLG” would contain only the activity since the backup dated 31st October called “My File (backup 31102016, 1250pm).QBB”
Therefore the TLG file would contain data that has been added/deleted/modified from 01/11/2016 to 30/11/2016.
If the TLG file is in good condition/undamaged and the backup dated 31st October is also in good condition then the chance of a successful recovery is high and the resulting reconstructed data file will contain all the info from the 31st October backup as well as the changes in the TLG file from 01/11/2016 to 30/11/2016.
If the backup dated 31st October is damaged, yet the prior backup dated 30th September is in good condition, then whilst the TLG file can still be useful in the recovery effort, the resulting reconstructed file will be missing the data from the period 01/10/2016 to 31/10/2016.
If the backup dated 31st October and 30th September are both damaged, yet the prior backup dated 30th June is in good condition, then whilst the TLG file can still be useful in the recovery effort, the resulting reconstructed file will be missing the data from the period 01/07/2016 to 31/10/2016, yet contain data in the period 01/11/2016 to 30/11/2016 that came from the TLG file.
Regards,
Reckon Data Recovery Team
