Well if we are sticking to being able to do with elves what was can do with Digimon rule I think I've seen the straight up copying works but the Copied data becomes a alive and is deleted from your file as it now has the ability to leave your file on it's own. So every time you wanted to make a new copy of that elf you have to scene the data of a living one and refile/rebuild it.
In Cyber Sleuth Digimon can be used to run programs like aps. Cookies, Malware, Firewalls, VPNs. In the real world they can control light switches, air-conditioning and, Some might have to work to gather to work something like video games like Street Fighter or something.
I think you have to be actively scanning each elf to effect an elf's data kind of like opening a file. So you'd have to catch her in your scanning field witch causes a file to pop up on you computer showing her code/data. If you are familiar with what does what you could delete her clothes, mess her boob size, change her eye color or make her blind, adjust her hair>>8906138>And there's no need for an annoying clean up because it's all stimulated.
Under Digimon rules, Elves poop and pee, waste and trash causes bugs and can make the other living programs sick and have to make made sure to be cleaned from he system.
In wilds of the net elves don't have homes or toilets and finds nice out of away spot to do their business, a little poo and pee does nothing but enough of it builds and the system area starts to riot and break down as it data get corrupted.
I'm sure if you are keeping an elf or elves you'd have some kind of waste disposal plan. Side not this also means Elves need to bathe as dirty elves can cause corruption if they don't wash/scrub them selves of waste data.