shrinking artwork to fit in librelec build

hi, im trying to build a gaming box using a cheap android box with libreelec and IARL, but im finding the artwork that it is populating after building up a few systems amounts to alot of gigs, when backing the build up, to the point of not being able to restore the backup on my 8 gig box because of lack of space, is there anyway of shrinking the arkwork to take up less space?

artwork, boxart,fanart, i have tried to unzip the tar backup and run the images through a resizer program zip it back up and restore, but no luck.

Quote from Compos

What about running from a 32Gb micro SD?

ive used the build on a 16gig sd card aswell, but after ive cached all the artwork, it fills up 10 gig just for that before even putting roms on it,

Quote from CvH

advancedsettings.xml - Official Kodi Wiki

there you can trim down the fanart etc, but only applies to new added stuff

so if i was to use this, what would i put down to scrape lowish rez artwork?