You have a tape cycle of 10, what is your dump cycle ? Certain less than 10, hopefully less than 5. 5 given one untouched copy of the your level 0 backup while the older level 0 is being overwritten (assuming a single level 0 per dump cycle).
the dump cycle, runs per cycle, and tape cycle are 10.
What are you trying to do ?
just ensure there is some kind of snapshot history going back, say three months, in case i need to reach into the distant past for a file. maybe a once-weekly snapshot...
Are you looking for periodic level 0 that are outside of the normal tape pool or rotation ?
i think this is what i'm after. perhaps combine this with your suggestion to lower the dump cycle to < 5 ? can i just change this value in amanda.conf?