Yuval Hager wrote:
בThursday 23 April 2009, נכתב על ידי Yuval Hager:
On Thursday 23 April 2009, Shachar Shemesh wrote:
I should point out one huge disadvantage of storing binary diffs when
using encrypted systems. There is no (practical) way to erase old
backups. Your backup storage size is bound to be ever increasing. This
is because the only way to create a new complete snapshot (i.e. - a
non-incremental backup) is to retransmit the entire backup data.
Because the remote side is encrypted, you cannot use it to expand the
image remotely.
I have not given as much thought as you to the details here, but if I
read the man page correctly, duplicity does allow to --remove-older-than.
I am not sure how that works though.
I've continued to read on that - as long as you have at least one full
backup, you can deleted earlier backups (which is quite obvious). The
main reason I am using rdiff-backup is that I can delete backups older than
a certain time, as much as I like, without ever running a full backup
besides the initial backup. The only limitation is that the data is not
compressed nor encrypted on the destination.
And with rsyncrypto+rsync, you can do all that AND have them encrypted
and compressed.
Shachar
--
Shachar Shemesh
Lingnu Open Source Consulting Ltd.
http://www.lingnu.com
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