I have always calculated my volume retention period based on its last written date, and time. This means when I want to plan for a new configuration, I will consider how long it takes for the backup to complete - say if it takes 2 hours to complete and I need a retention period of 1 day, I will minus the 2 hours so it'll become 22h, though normally I'll minus a couple of more hours just to be safe.
>>From the manual: Search the Pool for a Volume with VolStatus=Recycle and the InChanger
flag is set true (if there is more than one, the Volume with the oldest
date last written is chosen. If two have the same date then the one
with the lowest MediaId is chosen).
Does the time count? Or bacula just look at the date and count it from 0000 hours?
Yes it does bu you should read documentation about recycling. When Bacula cannot find a backup ready volume (volstatus = Append or Recycle/Purge) then it perform a recycle procedure.
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