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i'm not using tapes, i just have my volumes stored in a directory. it's
my intention to take a full backup every month on the first, with
incrementals and differentials during the month like in the default
configuration. with a volume use duration of 23 hours, a new volume
will get created every day. so, it seemed reasonable to me to have the
volume retention set to 40 days. with AutoPrune and Recycle both set to
yes, this seemed like a maximum of 40 volumes would be created and used,
thus limiting the amount of disk space the backups would use.
but then i started reading the other settings for the Pool resource, and
confusion ensued.
in there, it indicates the minimum volume retention should be twice the
interval of my full backups, i.e. two months. anyone care to explain
that? it seems to me with a 40 day limit, at least 2 full backups will
always exist.
secondly, it goes on to say that i should be using `Action On Purge =
Truncate` along with a RunScript in my CatalogBackup Job to run `purge
volume action=all allpools storage=File`. when i went to read up on the
`purge volume` command, it seems to me that the command should really be
`purge volume action=*truncate* allpools storage=File`.
finally, i then went on to read about the "Recycle Oldest Volume"
directive which sounds reasonable, but i'm confused as to what is really
happening without this directive set to yes.
is all of this really necessary? thanks
here's my Pool resource currently,
Pool {
Name = File
Pool Type = Backup
Recycle = yes
AutoPrune = yes
Volume Retention = 40 days
Maximum Volume Bytes = 100G
Maximum Volumes = 100
LabelFormat = "Vol"
Volume Use Duration = 23h
}
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