Basically I'm pretty sure I know how to decrypt a game, but isthere an easy way to reencrypt it. I want to store the decrypted ones in backup form maye try to compress them somewhat, and then reencrypt them when I'm actually going to play them.

 

What would be the point in reencrypting them? The decrypted versions can be played just fine.

 

well not really, a fully decrypted rom cant be played, only zero key encryption (which would have pretty much the same file size as standard encryption).....but for the sake of science i just tested it out with NSMB2 SE,
normal encryption trimmed size size = 342mb,
normal encryption compressed = 342mb
zero key encrypted compressed = 359mb (i think i had a few extra files in the romfs folder)
plain fs with all files required to rebuild as zero key'd rom = 240mb
(all just best compression rar, so other compression methods may vary......plus it will obviously vary from game to game)

so yeah ready to be rebuilt roms fair better, file size for just plain decrypted roms would probably about the same as the plain fs, but more complicated to re-encrypt when it comes to playing it again

 

NSMB2 Special edition (the one with the dlc built in) what i have been looking at atm so just what i had ready to test with....as for raring i figured it was best to just use the "standard", but it proved the point anyway like a 33% saving of space

 

nope, sky3ds will only work with properly encrypted games, zero key'd games will only really work with gateway/clones and cfw