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. -- yuval
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