Once in a while ....mostly after System Updates/upgrades with Synaptic Packet Manager,or updating Web Browser or my favorite Media Players (VLC/ Smplayer/Smtube) ....i save my "updated" System ,which now is just "temporary" stored/saved into the "Save Folder".
After a while of testing.....when everything seems save/fine i do a "Quick Remaster" to merge "Save Folder" with the Main 01.filesystem.squashfs .........."Save Folder" is now empty at the next Reboot ( cause merged into the Main 01.filesystem.squashfs).
I keep a Backup of the older 01.filesystem.squashfs .......to be on the save Side.......just in Case.
That`s just the Way i do it.......Never encountered any "visible" Problem until now.
But i am anyway not to much "paranoid" regarding "Cybersecurity"........i gave up on it.
On my working System (mostly Web browsing) anyway is nothing much important .