Created with GIMP.
Did you know that the feature request for an autosave feature is allowed to drink alcohol is the US as of last year? In Germany it could get a truck license.
Konsole has the option to set scrollback line count and an alternative "infinite" where it just writes to a file on disk.
GIMP can also have that and can ask for which disk it wants you to use, so if you have a 20TB HDD to dedicate for that, might as well.
In this case, the most recent 10 or so remain in RAM, while others only have a reference to it, in RAM.