Archives back-up : Log workflow and project management

Hi everyone,

First things first : I work for a fairly big venue and shoot in S-Log3 but I believe that's not the question since my problem applies to every kind of Log workflow and every kind of venue.

My editing process is quite simple : import footage, trim A-Roll, trim B-Roll, edit, color grade, export... you know the drill. 
Once done , my movie isn't really important anymore, it can be stored as is. My A and B-roll on the other side are a different story : the will be re-used heavily.

Using the project manager (copy only used files) isn't cutting it so I'd like to transcode my trimmed clips... but I don't want to bake in color, I need to keep my Log files as is.

Do you guys have a solution other than keeping your whole project ?
Thanks for your input,

Cheers,

N.