Linux Format forums

[silly_xp_user]

Hello,

Can anyone please help...

I have 2 ways of backing up a drive (with the output split) to a drive on a network:-

[MartyBartfast]

Never used dd, so can't really comment, but I can offer another option:

/sbin/dump -0 -z9 -M -B 256000 -f bak.dump /usr

will give you a compressed multi volume dump of /usr in bak.dump001 bak.dump002 etc with each portion being 256 Meg,
you then need restore to recover files from the dumps
_________________
I have been touched by his noodly appendage.

[nelz]

I don't think dd is the right tool for this job, because you are copying every bit on the disk, even the no longer used spaces. I'd use partimage for this, which works well over a network, only backs up the parts of the disk that are in use and is capable of splitting and gzipping the files.

However, if you do want to use dd, you aren't quite correct in stating that A "gzips the entire drive and then splits the output". The use of pipes mean that dd, gzip and split are operating simultaneously. One of the advantage of this is that the data is compressed before transfer over the network, which is usually faster, unless you have a very fast network and are backing up a slow machine. In that case you could use B with a file notification program running on the destination machine, something like fileschanged which will detect each new backup file and can be told to gzip it.
_________________
"Insanity: doing the same thing over and over again and expecting different results." (Albert Einstein)

[wdlerner]

Your block size seems a bit large. Can you explain why you are using a 16 Megabyte block size?

Thanks!