Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
Hi, Tyler J. Wagner wrote on 2009-10-21 15:35:20 +0100 [Re: [BackupPC-users] how to have 1 full backup + incrementals forever?]: But you'd also want to adjust the IncrKeepCnt to 8*6 = 42, to keep those dailies. for the archives, 8*6 is 48, not 42. Remember: what do you get if you multiply six by nine?. Regards, Holger -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List:https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki:http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
On Thursday 22 October 2009 17:01:53 Holger Parplies wrote: for the archives, 8*6 is 48, not 42. Remember: what do you get if you multiply six by nine?. I stared at that math for at least 30 seconds before sending. I suppose I shouldn't respond to list mail 2 hours past bedtime. :) Tyler -- One of the main causes of the fall of the Roman Empire was that, lacking zero, they had no way to indicate successful termination of their C programs. -- Robert Firth -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List:https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki:http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
Holger Parplies wrote: for the archives, 8*6 is 48, not 42. Remember: what do you get if you multiply six by nine?. Actually, I'm a little confused. shouldn't it be 6x6=36? 6 weeks of 6 incrementals each week. -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List:https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki:http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
Tyler J. Wagner wrote:
$Conf{FullPeriod} = '6.97';
$Conf{FullKeepCnt} = [ '4', '3', '4' ];
That is 4 weeks, then 3 period of 2 weeks, then 4 periods of 4 weeks.
But if you want just want dailies for 5 years, the settings would be:
$Conf{FullPeriod} = '6.97';
$Conf{FullKeepCnt} = '260';
$Conf{FullKeepCntMin} = '260';
$Conf{FullAgeMax} = '1825';
$Conf{IncrPeriod} = '0.97';
$Conf{IncrKeepCnt} = '1560';
$Conf{IncrKeepCntMin} = '1560';
$Conf{IncrAgeMax} = '1825';
This will actually keep files for longer (one day longer for each day the PC
misses a backup). You could set the KeepCnt, KeepCntMin, and AgeMax
variables
to higher if you want longer.
Regards,
Tyler
If I wanted to change my schedule so that I'd keep 6 weeks of dailies, 8
weeks of 2 week periods, 13 periods of 4 weeks, 0 8 weeks, 16 of 16
weeks, and delete them after they age 1825 days, then all i'd need to do
is change
$Conf{FullKeepCnt} = ['6','8','13','0','16'];
$Conf{FullKeepCntMin} = '16';
correct?
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Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
On Wednesday 21 October 2009 15:11:41 Adam Williams wrote:
If I wanted to change my schedule so that I'd keep 6 weeks of dailies, 8
weeks of 2 week periods, 13 periods of 4 weeks, 0 8 weeks, 16 of 16
weeks, and delete them after they age 1825 days, then all i'd need to do
is change
$Conf{FullKeepCnt} = ['6','8','13','0','16'];
$Conf{FullKeepCntMin} = '16';
That is correct. But you'd also want to adjust the IncrKeepCnt to 8*6 = 42,
to keep those dailies.
Regards,
Tyler
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[BackupPC-users] how to have 1 full backup + incrementals forever?
Due to the nature of my business, I'd like to have BackupPC perform one
full backup and then have incremental backups continue indefinitely. Is
the only way to do this, is to set the parameters in config.pl to very
large numbers?
$Conf{FullKeepCntMin} = 1;
$Conf{FullAgeMax} = 9;
$Conf{IncrKeepCnt} = 9;
$Conf{IncrKeepCntMin} = 9;
$Conf{IncrAgeMax} = 9;
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Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
Is there a point to doing this? Note that if you use rsync, only the
changed files are transferred even during a full backup...
Due to the nature of my business, I'd like to have BackupPC perform one
full backup and then have incremental backups continue indefinitely. Is
the only way to do this, is to set the parameters in config.pl to very
large numbers?
$Conf{FullKeepCntMin} = 1;
$Conf{FullAgeMax} = 9;
$Conf{IncrKeepCnt} = 9;
$Conf{IncrKeepCntMin} = 9;
$Conf{IncrAgeMax} = 9;
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Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
Adam Williams wrote:
Due to the nature of my business, I'd like to have BackupPC perform one
full backup and then have incremental backups continue indefinitely. Is
the only way to do this, is to set the parameters in config.pl to very
large numbers?
$Conf{FullKeepCntMin} = 1;
$Conf{FullAgeMax} = 9;
$Conf{IncrKeepCnt} = 9;
$Conf{IncrKeepCntMin} = 9;
$Conf{IncrAgeMax} = 9;
That's generally a bad idea. Incremental backups with non-rsync methods
won't catch new files created by methods that maintain old timestamps or
the new locations of files under renamed directories. Rysnc
incrementals either copy everything that has changed since the previous
full if you don't use incremental levels or they have to do a lot of
extra work to merge all of the accumulated differences in the
incrementals if you do.
Backuppc doesn't store duplicate copies and if you use rsync, doesn't
transfer files you had in the last full, so there is not a big downside
to doing fulls weekly or so.
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Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
Yes, in my config.pl I have:
$Conf{XferMethod} = 'rsync';
I'm doing this because it's what management wants, to be able to restore
a file from any backup, so the backups will have to span indefinitely.
There are times when i've been asked to restore a file that was last
touched by a user 3, 5, etc years ago and at some more recent point was
deleted. And to carry that out, I'm asking if I have the proper
configuration for that. I am open to suggestions on how often I should
be doing full and incremental backups.
Michael Stowe wrote:
Is there a point to doing this? Note that if you use rsync, only the
changed files are transferred even during a full backup...
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Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
Since files are pooled, there's really no downside to you doing full
backups every 7 days and incrementals every night, and just increasing
your retention periods to something you can live with.
If you're going to keep all those incrementals, I wouldn't recommend doing
full backups any less frequently than every two weeks or so, which is
often the point at which they become as slow or slower than full backups.
Yes, in my config.pl I have:
$Conf{XferMethod} = 'rsync';
I'm doing this because it's what management wants, to be able to restore
a file from any backup, so the backups will have to span indefinitely.
There are times when i've been asked to restore a file that was last
touched by a user 3, 5, etc years ago and at some more recent point was
deleted. And to carry that out, I'm asking if I have the proper
configuration for that. I am open to suggestions on how often I should
be doing full and incremental backups.
Michael Stowe wrote:
Is there a point to doing this? Note that if you use rsync, only the
changed files are transferred even during a full backup...
--
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Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
I'm confused on what my configuration parameters should be then, to keep
a full every other week, plus incrementals for that two week period, but
retain forever. does this look correct?
$Conf{FullKeepCnt} = ['0', '2'];
$Conf{FullKeepCntMin} = '1';
$Conf{FullAgeMax} = '9';
$Conf{IncrKeepCnt} = '13';
$Conf{IncrKeepCntMin} = '1';
$Conf{IncrAgeMax} = '13';
$Conf{FullPeriod} = '13.97';
$Conf{IncrPeriod} = 1;
$Conf{IncrLevels} =
['1','2','3','4','5','6','7','8','9','10','11','12','13'];
Michael Stowe wrote:
Since files are pooled, there's really no downside to you doing full
backups every 7 days and incrementals every night, and just increasing
your retention periods to something you can live with.
If you're going to keep all those incrementals, I wouldn't recommend doing
full backups any less frequently than every two weeks or so, which is
often the point at which they become as slow or slower than full backups.
--
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Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
Tyler J. Wagner wrote:
Hi Adam,
Storing indefinitely is only a disk capacity issue. The question is: to what
granularity do you want old backups kept? Do you want to be able to recover
the file 2 years, 3 months, and 2 days ago, and also the one 2 years, 3
months, and 3 days ago? If so you have no choice but to take a backup every
day and set retention to a very high level.
On the other hand, if it is acceptable to dailies for 2 months, and then
weeklies after that for 6 months, and then only monthlies - that can easily
be
done with FullKeepCnt, FullKeepCntMin, FullAgeMax, and the Incr equivalents.
For instance, for my fulls I go back about 5 months, but in decreasing
granularity, with:
$Conf{FullPeriod} = '6.97';
$Conf{FullKeepCnt} = [ '4', '3', '4' ];
That is 4 weeks, then 3 period of 2 weeks, then 4 periods of 4 weeks.
But if you want just want dailies for 5 years, the settings would be:
$Conf{FullPeriod} = '6.97';
$Conf{FullKeepCnt} = '260';
$Conf{FullKeepCntMin} = '260';
$Conf{FullAgeMax} = '1825';
$Conf{IncrPeriod} = '0.97';
$Conf{IncrKeepCnt} = '1560';
$Conf{IncrKeepCntMin} = '1560';
$Conf{IncrAgeMax} = '1825';
This will actually keep files for longer (one day longer for each day the PC
misses a backup). You could set the KeepCnt, KeepCntMin, and AgeMax
variables
to higher if you want longer.
Regards,
Tyle
Thanks, Disk capacity really isn't much of an issue. Disks are getting
larger and cheaper, storage ability is expanding with 64-bit Linux +
RAID + xfs file system + LVM + iSCSI. The config.pl comments weren't
making that much sense to me, but the paramaters are starting to make
sense now that I have some examples. The period is one week, daily
incrementals, 260 weeks of full backups in 5 years, 1825 days in 5
years, 1560/260 = 6 incrementals per week that will be retained.
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Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
Adam Williams wrote:
Yes, in my config.pl I have:
$Conf{XferMethod} = 'rsync';
I'm doing this because it's what management wants, to be able to restore
a file from any backup, so the backups will have to span indefinitely.
There are times when i've been asked to restore a file that was last
touched by a user 3, 5, etc years ago and at some more recent point was
deleted. And to carry that out, I'm asking if I have the proper
configuration for that. I am open to suggestions on how often I should
be doing full and incremental backups.
If you have many logfiles, mailboxes, or database files you'll burn up a
lot of space keeping every incremental. Do you need to be able to
restore from any day's backup or would one a week be enough after you go
back a month or so? Regardless, I'd try to stick with weekly fulls and
daily incrementals (the defaults) and set $Conf{FullKeepCntMin} to a
very large number so fulls won't ever be deleted and
$Conf{IncrKeepCntMin} to the number of days back that you'll need daily
access (or also very large if you don't want any incrementals to be
deleted).
--
Les Mikesell
lesmikes...@gmail.com
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Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
On Tuesday 20 October 2009 18:42:07 Adam Williams wrote: Thanks, Disk capacity really isn't much of an issue. Disks are getting larger and cheaper, storage ability is expanding with 64-bit Linux + RAID + xfs file system + LVM + iSCSI. The config.pl comments weren't making that much sense to me, but the paramaters are starting to make sense now that I have some examples. The period is one week, daily incrementals, 260 weeks of full backups in 5 years, 1825 days in 5 years, 1560/260 = 6 incrementals per week that will be retained. Exactly. And don't forget that when you edit the config via the web GUI, every variable is a hyperlink to the documentation. It doesn't take that long to understand that way. I do *everything* by the command line, so it says a great deal about the quality of the web interface and documentation that I prefer it. Regards, Tyler -- About astrology and palmistry: they are good because they make people vivid and full of possibilities. They are communism at its best. Everybody has a birthday and almost everybody has a palm. -- Kurt Vonnegut, Wampeters, Foma and Granfalloons -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List:https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki:http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
