If you set up "Volume Retention" and "Volume Use Duration" correctly in your
Pool definition, Bacula should recycle and use any appendable volume you insert.
For example, in one of my pools, I have eight 1TB SATA hard drives used in a
two-week rotation. Set 1 is four hard drives with each of those drives
representing one day of the week between Monday through Thursday. Set 2 of the
remaining four drives would be the next Monday through Thursday. Each day, I
perform a full backup of my clients. I have a separate five-set Friday pool.
Pool {
Name = DailyPool
Pool Type = Backup
Recycle = yes
AutoPrune = yes
Volume Retention = 13 days
Volume Use Duration = 20 hours
}
By setting "Volume Use Duration" to 20 hours, Bacula would mark the volume from
"Appendable" to "Used" automatically after 20 hours when first used. This way
I don't have to manually mark a volume as "Used." When I come into the office
in the morning, I swap the hard drive with the next appendable volume.
This appendable volume would be recycled by Bacula according to "Volume
Retention" set to 13 days, exactly a day before I recycle my two-week set.
In your case, for example, if you set "Volume Retention" to be 7 weeks 6 days
and "Volume Use Duration" to about 6 days (or however long before you put in
the next USB HD), it should recycle your volumes correctly.
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