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Since you are willing to go back in time, up to 21 days, you should be able, with existing “hooks” to make a copy of the clone aka old_rootvg, but just not add that disk to the bootlist.
Or, you could look at a savevg of old_rootvg.
Lastly, you could also look at using multibos, read including multibos in your process. Maybe altdisk and multibos, by design, will not work together, but it is worth examining.
Since you are willing to go back in time, up to 21 days, you should be able, with existing “hooks” to make a copy of the clone aka old_rootvg, but just not add that disk to the bootlist.
Or, you could look at a savevg of old_rootvg.
Lastly, you could also look at using multibos, read including multibos in your process. Maybe altdisk and multibos, by design, will not work together, but it is worth examining.
You can have multiple, just only one can be imported at a time due to mount locations.
You can use rendev to name your multiple alt disks something interesting, like ALT20190618.
You can steep it with alt_rootvg_op -S, and then export -X, and import a specific one with -W -d alt20190529, or rendev and overwrite with your normal create.
I've used alt_disk to make 8 clones, then send them all to different hosts.
The issue with rendev, or if you could wake/sleep to import multiples, is that the naming is and would be in ODM of whatever you are booted from. There's no practical way to keep that in sync among multiples.