Valeri Galtsev wrote:
On Mon, November 9, 2015 12:42 pm, m.roth@5-cent.us wrote:
Gordon Messmer wrote:
On 11/09/2015 09:59 AM, John R Pierce wrote:
On 11/9/2015 9:50 AM, Gordon Messmer wrote:
I don't see the distinction you're making.
a incremental backup copies everything since the last incremental a differential copies everything since the last full.
I guess that makes sense, but in backup systems based on rsync and hard links (such as rsnapshot), *every* backup on the backup volume is a "full" backup, so incremental and differential are the same thing.
rsync is NOT a backup system, its just a incremental file copy
<snip>
Actually, we use rsync for backups. We have a script that creates a new daily directory... and uses hard links to previous dates. That way, it looks like a full b/u... but you can go to a previous date to restore an older version of the file (aka ACK! I saved that file full of garbage to my Great American Novel filename! <g>).
I wonder how filesystem behaves when almost every file has some 400 hard links to it. (thinking in terms of a year worth of daily backups).
That, I can't answer - what we have is "disaster recovery", not "archive", so we only keep them for no more than five weeks.
On the other hand... a reasonable approach would be for, over maybe two months old, to keep the first of the month, and rm everything else for the month.
mark