Dean S. Messing wrote: > Michael Tokarev writes: [] > : the procedure is something like this: > : > : cd /backups > : rm -rf tmp/ > : cp -al $yesterday tmp/ > : rsync -r --delete -t ... /filesystem tmp > : mv tmp $today > : > : That is, link the previous backup to temp (which takes no space > : except directories), rsync current files to there (rsync will > : break links for changed files), and rename temp to $today. > > Very nice. The breaking of the hardlink is the key. I wondered about > this when Michal using rsync yesterday. I just tested the idea. It > does indeed work. Well, others in this thread already presented other, simpler ways, namely using --link-dest rsync option. I was just too lazy to read the man page, but I already knew other tools can do the work ;) > One question: why do you not use "-a" instead of "-r -t"? It would > seem that one would want to preserve permissions, and group and user > ownerships. Also, is there a reason to _not_ preserve sym-links > in the backup. Your script appears to copy the referent. Note the above -- "SOMETHING like this". I was typing from memory, it's not an actual script, just to show an idea. Sure real script does more than that, including error checking too. /mjt - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
