>>>>> On Mon, 19 Nov 2007 18:55:30 -0300, Augusto Camarotti said: > > Nowadays we have a backup strategy like this : > Daily Backup = Monday-Thursday = Full Backups with individual tapes for each > weekday. > Weekly Backup = 2nd-5th Friday =3D Full Backups with individual tapes for 7 > Fridays > Montly Backup = 1st Friday = Full Backups with individual tapes for 12 > months > > This way I'm using 23 tapes. > > Then I was reading about Differential backups, and this strategy came into > my mid : > > - One Full Backup on the first day of the year, say 2nd January (since 1st > it's a holyday) on disk, in the storage machine. The data would be stored in > a tape, which would be taken offsite. > - 364 Differential backups, one for each day of the year. Using the 23 tapes > to do it. > > Since the amount of data added on a year it's a maximum of 3 GB, the 23 > tapes will be enough to backup every day on a year.
Beware that the amount of new data added in a year is not sufficient to calculate this. You also need to include the amount of data *changed* since the beginning of the year, because that will be backed up each day. > Well, as I didn't find any recomendations to this strategy, I was in doubt > if it would be fine to do this way. > > Suggestions or Critics are welcome. Differential/incremental backups have a disadvantage that they do not track deleted files, which could be a major problem over a whole year. __Martin ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
