Re: Are incremental CD-bakups possible?

[The Natural Philosopher]

no.to...@gmail.com wrote:
> On my old system, I've only just figured out how to backup a tree by:--
>
> mkisofs -R /mnt/p6/usr/lib | cdrecord -v fs=6m speed=2 dev=0,0 -
>
> Obviously I'd rather not have small [10% of CD capacity] dir-trees on each CD,
> so I'd want to serially write several dir-trees to the same CD.
>
> Apparently the above instruction does:
> <read the tree & convert it> AND_THEN <write the converted data to CD>
> So then the 2nd step would start writing from the CD beginning ?
>
> But this is too simplistic since it's seen from the messages-while-running
> that a fifo is repeatedly written and read.
>
> So how can I read multiple dir-trees and write them to the CD ?
>
> == TIA
>
>
My advice, don't even try.

Consider:

which lasts longer, a hard drive of a user writeable optical disk?

Which has more capacity, a hard drive or a user writeable optical disk

Given a nightly backup, of say a 80GB drive, which costs more, a disk
that last for 5 years and costs 50 quid, or 6000 optical disks, and the
space to put them?

My solution is massively simple. A have a second hard drive, and rdiff
backs up onto it every night. Whichever disk goes, I have the other.

Since the disk only gets written to selected areas at a selected time of
day, even a power cut is unlikely to kill it.