CurtisE wrote:
>>"if they do level backups they will do the same level each day
>>(e.g. L5) so that they can always recover from one full and one level
>>backup."
> 
> 
> That's not quite right.  If they do the same level each day (except the day
> they do the full), they will need the media for the full and ALL level
> backups since the full (for a complete restore).
> 
> In order to restore from the last full and (at most) 1 level, they would
> need to decrement the level each day after the full (i.e. Full,9,8,7,6,5,4).
> 

No you're incorrect. To quote from the Admin guide, a level backup
"backs up files that have changed since the last backup with a lower
numbered backup level". So if you always use full and level 5, the level
5 will back up all files that have changed since the full backup,
defined as a level 0. You would not need any other level 5 backups taken
in the mean time. What you are describing is an incremental backup.

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