This is question I'd like to ask, to avoid wasting this kind of resources ..
I'd like to use some faulty disks just for volatile stuff or archive random crap or transport copies of copies …
I am sharing my research on this page
According to :
BtrFs seems an option, or greyhole, MhddFs but I am not yet convinced.
I'd rather hack something using Sar tool, and eventually RAID over partitions if it makes sense
I plan to use lessfs to store by random junk backup of backup of backups ..
This filesystem uses DeDuplication : http://en.wikipedia.org/wiki/Data_deduplication
feel free to install my deb package :
LessFS: I did rebuilt it also for armv5 but did not manage to run it …