Thanks for the information : I'm using a disk based solution, but after a few days worth's of Incremental backup, it looks like I could do a diff backup every weekend (even with 2To backup space is still a concern !).
-- Sebastian Perkins Responsable Informatique [EMAIL PROTECTED] ALPES CONTROLES 3 impasse des prairies 74940 Annecy le Vieux Tél. 04.50.64.11.46 - Fax. 04.50.64.23.83 http://www.alpes-controles.fr Marek Simon a écrit : > Differential and Incremental levels differ in this thing: Incremental > backup takes the files which has changed since any previous backup of > any level. Differental backup takes all files, which has changed since > previous Full (and only Full) backup. > So with your current strategy (one Full per month, Incr other days), > if you would have to restore files just a day before new full backup, > you must restore from full backup volume and then from 30 records in > volumes containing those Incremental ones, which takes longer time. > You see this strategy is not usable if you need to backup to tapes. > If you have some Differential backup (lets say) every weekend, in > worst case you must to restore from 1 Full backup, one Differential > (which contains all files from last Full backup, which means in this > case 3 weeks) and from 6 Incremental backups. The restore would be > quicker, but the space needed for backups is bit bigger (in some cases > can be even smaller). However, if you have all your backups on some > kind of disk array and it is reliable, bacula is able to restore data > from 30 Incremental backups with no problem. You still need to keep > all your volumes with Incremental backups in non-interupted sequence, > or you risk the lose of some files. Of course the Full backup must be > all right too. > MArek > > > Sebastian Perkins napsal(a): >> Thanks both for the info. >> >> I've been going through the "Maximum Volume Jobs" option with mutiple >> volumes for incr & full as in the "automated disk backup" example. >> Just that I trimmed everything down to one month (ie just 2 full >> volumes & 31 incr ones). >> >> With a test situation with 10min retention times between full's ... >> volumes are recycling reaaaal nice ! >> >> One question remains : do I need differential in my stratrgy ? >> >> Regards >> >> Sebastian Perkins >> Responsable Informatique >> [EMAIL PROTECTED] >> >> ALPES CONTROLES >> 3 impasse des prairies >> 74940 Annecy le Vieux >> Tél. 04.50.64.11.46 - Fax. 04.50.64.23.83 >> http://www.alpes-controles.fr >> >> ----- Message Original ----- >> De: "Marek Simon" <[EMAIL PROTECTED]> >> Cc: bacula-users@lists.sourceforge.net >> Sent: lundi 19 novembre 2007 10 h 30 (GMT+0100) Europe/Berlin >> Sujet: Re: [Bacula-users] backup strategy >> >> David is right. Bacula is not able to clear a part of a volume. She can >> only append to a volume or clean it completely. I can recommend to have >> one volume for one day (Use duration 23 hours). Bacula will create new >> volumes everywhen she needs. >> Marek >> >> David Legg napsal(a): >> > Hi Sebastian, >> > >> > I'm only a newbie to this but looking at your director config settings >> > it looks like you haven't expressed a maximum volume size. Therefore >> > Bacula will keep filling up a volume until your disk runs out. To >> force >> > Bacula to stop filling a volume and look around for another one you >> > should use a 'Maximum Volume Bytes = nnn' or 'Maximum Volume Jobs = >> nnn' >> > or 'Volume Use Duration = ttt' setting in your pools definition. >> > >> > Re-read the beginning of Chapter 22 'Automatic Volume Recycling' for >> > more details. >> > >> > Hope that helps. >> > >> > Regards, >> > >> > David Legg >> > >> > >> > Sebastian Perkins wrote: >> > >> Hi, >> >> >> >> We are using bacula 2.2.6 with a disk based backup solution. 3 Months >> >> into testing, backups & restores are working. >> >> >> >> Here goes the problem : we need to backup 750Gb of data (22 server >> >> samba shares) and guarantee one (maybe two) months of restore data >> >> just in case somebody moves a directory, loses a file, wants lask >> >> week's file etc... The samba shares are basically full of doc/xls/pdf >> >> etc... >> >> >> >> The backup is a 2 To raid5 disk solution. I'm a bit worried about >> >> keeping control over volumes and disk space. I don't want the volumes >> >> to fill up any further than 1.8To while keeping one or 2 months of >> >> history. >> >> >> >> We've resolved one problem regarding size by using the compress >> option :o) >> >> >> >> So, our bacula.conf strategy is : >> >> >> >> * one full backup per month, plus incremental every other day (no >> >> differential). >> >> * one volume per share (so that we can keep a eye on a fast >> >> growing volume). >> >> * keeping job/file/volume retention to 1 month (maybe 2). >> >> >> >> But the volumes just grow... and grow. I've 'volume updated' for >> >> retention periods but the auto-pruning doesn't seem to reduce volume >> >> size. For example after the 2nd month's full backup I thought the >> >> volume would be reduced in size by the 1st month"s full backup size >> >> (it's outside the retention period). >> >> >> >> Schedule, Volume & Client syntax are : >> >> >> >> Schedule { >> >> Name = "WeeklyCycle" >> >> Run = Full 1st sun at 00:05 >> >> Run = Incremental mon-sat at 23:05 >> >> #Run = Differential 2nd-5th sun at 23:05 >> >> #Run = Incremental mon-sun at 23:05 >> >> } >> >> >> >> Client { >> >> Name = pool01-fd >> >> Address = 192.168.x.y >> >> FDPort = 9102 >> >> Catalog = MyCatalog >> >> Password = "xxx" >> >> File Retention = 1 month # 30 days >> >> Job Retention = 1 months # 30 days >> >> AutoPrune = yes # Prune expired Jobs/Files >> >> } >> >> >> >> Pool { >> >> Name = Pool01 >> >> Pool Type = Backup >> >> Recycle = yes # Bacula can automatically >> >> recycle Volumes >> >> AutoPrune = yes # Prune expired volumes >> >> Volume Retention = 1 month # one month >> >> LabelFormat = "Vol01" >> >> } >> >> >> >> >> >> So, just 2 questions : Is my strategy right ? Why are the volumes >> >> growing ? >> >> >> >> Thanks for any help ! >> >> >> >> Sebastian Perkins >> >> Responsable Informatique >> >> [EMAIL PROTECTED] >> >> >> >> ALPES CONTROLES >> >> 3 impasse des prairies >> >> 74940 Annecy le Vieux >> >> Tél. 04.50.64.11.46 - Fax. 04.50.64.23.83 >> >> http://www.alpes-controles.fr >> >> >> >> >> ------------------------------------------------------------------------ >> >> >> >> >> ------------------------------------------------------------------------- >> >> >> This SF.net email is sponsored by: Microsoft >> >> Defy all challenges. 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