saf @saf@librem.one

@HunterZ @osm_tech this is actually quite common. Mobile advertising SDKs for games, background apps, etc include residential scraping proxy functionality that they can sell to the highest bidder, and then when scrapers want to avoid restrictions they can pay a fraction of a penny to send their requests via your phone. Millions of people use apps with this built in and have no idea. Most websites don't want to ban the residential scrapers because it can hurt growth.

Daughter:
Why is the default way to convert to PDF in Windows, to lie to the system and say that I want to print it?
Her young brother (16):
PDF stands for Print Dis File

@yaarur

/home got all your desktop environment settings as well as your data.
/etc got all your system settings, including networks available to all users - but restoring this directory on a new host need to be with great care
/var keeps a lot of application/service/runtime system data, as well as logs. Flatpak apps available to all users are also here, but no user data. This directory is great to have a backup of, but only to extract various specific data you realise you really need later on.
/opt and /usr/local are typically the end point for proprietary applications or external third-party software vendors shipping data outside of the ordinary repositories. Normally it makes little sense preserving them, unless you know some of the software uses these areas to save user/runtime data (which is not what these directories are intended for - but third-party vendors are too often ignorant to such advices).

I would also suggest to collect a list of all installed packages (dpkg -l, rpm -qa, etc) as well as all installed Flatpaks/snaps. If you notice you're missing something but can't tell exactly what, such lists can help solve it much quicker.

If you switch distro vendor or there is a larger version jump in the applications/desktop environments in your migration, be careful about $HOME/.config and $HOME/.local. Often it's good to use this as an opportunity to clean up a bit, and just copy over data you see you can reuse. In some cases, some extensions to programs may not work as well on the new host, causing instabilities or sluggishness.