[Bacula-users] Which full back up is an incremental/differential back up

As the title says, I want to know if within a JobID, does bacula possess any logic verification when selecting which full back up to base incremental/differential back ups on or does it simply uses the latest one.   The reason for this question is due to the nature of my schedule/volume configuration which can be seen below. As a courtesy, I'll summarize it as well.

1. Incremental/Differential Back ups every two hours into a pool which gets recycled every 23 hours
2. A full back up on sunday into a daily pool, then subsequent differential backups into the same pool Mon-Sat. This pool is recycled every 6 days.
3. A full back up on the first saturday of each month into a weekly pool, then incremental backs ups every saturday there after. This pool is recycled every 29 days
4. Full back up on Jan 1 into a monthly pool, then incremental back ups the first of all other months. This pool is recycled every 46 weeks
5. A full backup into a yearly pool on December 31 of every year. This pool is recycled every 5 years.

My fear is that a longer lasting incremental back up, such as one going into the weekly pool will be based on a full back up of a shorter lasting pool, such as the daily pool. I would then be unable to use this incremental/differential back up.

At first glance the naive solution seems to be to move the full back up into just the monthly/yearly pools but this seems like a poor practice. If anything went wrong with them the incremental/differentials would be useless. My next thought was to pull them into different JobIDs to ensure that the incrementals/differentials would be based on the proper data, which seems like a much better solution than the first.

Any advice would be greatly appreciated.

-Melvin Ross

Relevant Director config is below:

#
# Default Bacula Director Configuration file
#
# The only thing that MUST be changed is to add one or more
#   file or directory names in the Include directive of the
#   FileSet resource.
#
# For Bacula release 5.2.10 (28 June 2012) -- debian 6.0.5
#
# You might also want to change the default email address
#   from root to your address. See the "mail" and "operator"
#   directives in the Messages resource.
#

Director {                            # define myself
Name = debian-bacula-dir
DIRport = 9101                # where we listen for UA connections
QueryFile = "/etc/bacula/query.sql"
WorkingDirectory = "/var/bacula/working"
PidDirectory = "/var/run"
Maximum Concurrent Jobs = 1
Messages = Daemon
}

JobDefs {
Name = DefaultJob
Type = Backup
Level = Incremental
Client = debian-bacula-fd
FileSet = "Full Set"
Schedule = WeeklyCycle
Storage = debian-bacula-sd
Messages = Standard
Pool = File
Priority = 10
Write Bootstrap = "/var/bacula/working/%c.bsr"
Enabled = No
}

Client {
Name = sbsserver02-fd
Address = SBSSERVER02
FDPort = 9102
Catalog = MyCatalog
File Retention = 5 years
Job Retention = 5 years
}
Job {
Name = SBServer
Type = Backup
Client = sbsserver02-fd
Pool = YearlyPool
FileSet = SBSServer
Storage = debian-bacula-sd
Messages = Standard
Schedule = BrilliantBackupSchedule
}
Schedule {
Name = BrilliantBackupSchedule
Run = Level=Incremental Pool=HourlyPool at 00:00
Run = Level=Incremental Pool=HourlyPool at 2:00
Run = Level=Incremental Pool=HourlyPool at 4:00
Run = Level=Incremental Pool=HourlyPool at 6:00
Run = Level=Incremental Pool=HourlyPool at 8:00
Run = Level=Incremental Pool=HourlyPool at 10:00
Run = Level=Differential Pool=HourlyPool at 12:00
Run = Level=Incremental Pool=HourlyPool at 14:00
Run = Level=Incremental Pool=HourlyPool at 16:00
Run = Level=Incremental Pool=HourlyPool at 18:00
Run = Level=Incremental Pool=HourlyPool at 20:00
Run = Level=Full Pool=DailyPool sun at 22:00
Run = Level=Differential Pool=DailyPool mon-sat at 22:00
Run = Level=Full Pool=WeeklyPool 1st sat at 22:00
Run = Level=Incremental Pool=WeeklyPool sat at 22:00
Run = Level=Full Pool=MonthlyPool jan on 1 at 00:00
Run = Level=Incremental Pool=MonthlyPool feb-dec on 1 at 00:00
Run = Level=Full Pool=YearlyPool dec on 31 at 23:59
}
Pool {
Name = HourlyPool
Pool Type = Backup
Volume Retention = 23 hours
Recycle = yes
AutoPrune = yes
Volume Use Duration = 23 hours
}
Pool {
Name = DailyPool
Pool Type = Backup
Volume Retention = 6 days
Recycle = yes
AutoPrune = yes
Volume Use Duration = 6 days
}
Pool {
Name = WeeklyPool
Pool Type = Backup
Volume Retention = 29 days
Recycle = yes
AutoPrune = yes
Volume Use Duration = 29 days
}
Pool {
Name = MonthlyPool
Pool Type = Backup
Volume Retention = 46 weeks
Recycle = yes
AutoPrune = yes
Volume Use Duration = 46 weeks
}
Pool {
Name = YearlyPool
Pool Type = Backup
Volume Retention = 59 months
Recycle = yes
AutoPrune = yes
Volume Use Duration = 59 months
}

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[Bacula-users] Which full back up is an incremental/differential back up based on if multiple full back ups exist within multiple pools with different retention periods?