Sorry, I'm going to need more advice on this!
Our Backup to Disk retention period is 30 days, and based on the advice in this thread I changed both our "Daily Incrementals" and "Friday Full Backup" media pools to have 30 days retention also.
Recently, the backup to tape has not started and we get a message - Insert tape to continue.
On looking at the logs, it's seems to be reporting that there are no usable tapes in the loader, but there are three tapes from the Daily Incremental pool currently loaded (we cycle the daily incremental tapes every day). They all have enough free capacity to append to (220GB, 677GB and 308GB free), but are overwrite protected. The amount of data to back up from last night is 66GB, shouldn't it just append to one of the tapes in the loader?
I just changed the Daily Incrementals media pool to have a 5 day retention period then ran the job manually and now it's working.
If we only ever wanted to have 1 months data on both disk and tape, what would our retention settings be on the Daily Incrementals pool? If we run with 30 days on disk, 30 days on Friday Full Backup and 5 days on Incrementals, would that cause problems?
Can I also ask....in the media pools we have a number of tapes that are showing 4.8GB free, so these tapes are full. If the overwrite protection period has passed, will these tapes be overwritten as required?