[plug] compressed, on the fly expandable file system for linux?

[Tomasz Grzegurzko]

W.Kenworthy wrote:
> Is there such a thing as a compressed, on the fly expandable file system
> for linux?  I am looking for something I can use for a whole system
> backup using dirvish, but I need space efficiency (I.e., a current
> tar.bz2 is ~17 G for around 35G of system & data - potentially 30G for a
> 60G data/system).  How a house with well over a terrabyte of storage has
> problems finding a large enough space for a backup is another story!)
> 
> Something like a writable, compressed loopback mounted file system that
> is on the fly expandable (perhaps sparse?)
> 
> I currently use rsync and unison which work ok, but I dont have room for
> multiple copies so its time to move to something that will do
> incrementals and store it as above.
> 
> BillK
> 
> 
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> 
Something like cloop (not crypto-loopback, compressed loopback) -- check 
knoppix for it, but I think thats roughly what you're after. May need to 
hack it a little to fit your needs, thats mainly for read only modes..