Back in the 90's, many of my co-workers would bring me their computers for various reasons, mostly viral because Win 95 and XP were, well you know.

Some would tell me they had teenage boys who may have gone to porn sites and they were afraid that's how they were infected. I would tell them to please get their personal stuff off the machine, because I would be looking for anything out of order. I explained I may have to reinstall windows and I didn't want them to lose their files. They never would! So I would burn their stuff to CD-ROM and then reload it all and give them the CDs.

I was a friend, not a business. If we expect businesses to be decent or prudent with what's on our devices we are naive. Get your stuff off first, then bring in the device! Human nature is always unpredictable.