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It'd be Day 0's backup, Day 28's backup, then the incremental from there.
The Cumulative is the changes since the previous full only.
One thing to consider is Day 366. If the full backups is expired and they
new full is on tape, you only have a base image from a day ago. If he wants
a restore for a fileset from three months ago, you might not have a
baseline.
The baseline backup has to be kept for twice the intended restoration
window.
Sucks, doesn't it.
-M
-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Piszcz,
Justin
Sent: Wednesday, November 09, 2005 12:35 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Cc: Girard, Dan
Subject: [Veritas-bu] [Incremental: (Differential + Cumulative)] + Full
Backup Policy Question
I have a client that will be backing up a data set which:
1) The client needs a full backup every 90 days with incrementals
backups in between on a 1 year retention policy.
I explained to the client that doing differential-incrementals would be a
nightmare to do a full restore.
I then continued to explain that cumulative-incrementals would use a lot of
tapes.
I suggested the following:
Day 0: Perform full backup.
Day 1: Perform differential-incremental.
Day 2: Perform differential-incremental.
Day 3: Perform differential-incremental.
Day 4: Perform differential-incremental.
Day 5: Perform differential-incremental.
Day 6: Perform differential-incremental.
Day 7: Perform cumulative-incremental. ***
Day 8: Perform differential-incremental.
Day 9: Perform differential-incremental.
Day 10: Perform differential-incremental.
Day 11: Perform differential-incremental.
Day 12: Perform differential-incremental.
Day 13: Perform differential-incremental.
Day 14: Perform cumulative-incremental. ***
Day 15: Perform differential-incremental.
Day 16: Perform differential-incremental.
Day 17: Perform differential-incremental.
Day 18: Perform differential-incremental.
Day 19: Perform differential-incremental.
Day 20: Perform differential-incremental.
Day 21: Perform cumulative-incremental. ***
Day 22: Perform differential-incremental.
Day 23: Perform differential-incremental.
Day 24: Perform differential-incremental.
Day 25: Perform differential-incremental.
Day 26: Perform differential-incremental.
Day 27: Perform differential-incremental.
Day 28: Perform cumulative-incremental. **
Day 29: Perform differential-incremental.
Day 30: Perform differential-incremental.
Day 31: Perform differential-incremental.
Suppose at the end of the month the client wanted a FULL restoration of all
files, by using this method tell me if this is correct:
1) Restore Day 0's full backup.
2) Restore the cumulative backup from Day7, Day14, Day21,Day28.
3) Restore the differential-incremental backups from Day29,30,31.
Then I would have fully restored all of the files, correct?
Please let me know if this makes sense.
Thanks!
Justin.
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<DIV><SPAN class=538354720-09112005><FONT face=Arial color=#0000ff size=2>It'd
be Day 0's backup, Day 28's backup, then the incremental from there. The
Cumulative is the changes since the previous full only.</FONT></SPAN></DIV>
<DIV><SPAN class=538354720-09112005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=538354720-09112005><FONT face=Arial color=#0000ff size=2>One
thing to consider is Day 366. If the full backups is expired and they new
full is on tape, you only have a base image from a day ago. If he wants a
restore for a fileset from three months ago, you might not have a
baseline.</FONT></SPAN></DIV>
<DIV><SPAN class=538354720-09112005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=538354720-09112005><FONT face=Arial color=#0000ff size=2>The
baseline backup has to be kept for twice the intended restoration
window.</FONT></SPAN></DIV>
<DIV><SPAN class=538354720-09112005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=538354720-09112005><FONT face=Arial color=#0000ff
size=2>Sucks,
doesn't it.</FONT></SPAN></DIV>
<DIV><SPAN class=538354720-09112005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=538354720-09112005><FONT face=Arial color=#0000ff
size=2>-M</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]<B>On Behalf Of
</B>Piszcz,
Justin<BR><B>Sent:</B> Wednesday, November 09, 2005 12:35 PM<BR><B>To:</B>
veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Cc:</B> Girard,
Dan<BR><B>Subject:</B>
[Veritas-bu] [Incremental: (Differential + Cumulative)] + Full Backup Policy
Question<BR><BR></FONT></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I have a client that will be
backing up a data set which:<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal
style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in; mso-list: l0 level1
lfo1"><![if !supportLists]><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN
style="mso-list: Ignore">1)<FONT face="Times New Roman" size=1><SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></FONT></SPAN></SPAN></FONT><![endif]><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">The client needs a full backup
every 90 days with incrementals backups in between on a 1 year retention
policy.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I explained to the client that
doing differential-incrementals would be a nightmare to do a full
restore.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I then continued to explain that
cumulative-incrementals would use a lot of tapes.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I suggested the
following:<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><B><FONT face=Arial size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 0: Perform
full backup.<o:p></o:p></SPAN></FONT></B></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 1: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 2: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 3: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 4: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 5: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 6: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><B><FONT face=Arial size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 7: Perform
cumulative-incremental. ***<o:p></o:p></SPAN></FONT></B></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 8: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 9: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 10: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 11: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 12: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 13: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><B><FONT face=Arial size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 14:
Perform
cumulative-incremental. ***<o:p></o:p></SPAN></FONT></B></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 15: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 16: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 17: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 18: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 19: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 20: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><B><FONT face=Arial size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 21:
Perform
cumulative-incremental. ***<o:p></o:p></SPAN></FONT></B></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 22: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 23: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 24: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 25: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 26: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 27: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><B><FONT face=Arial size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 28:
Perform
cumulative-incremental. **<o:p></o:p></SPAN></FONT></B></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 29: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 30: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Day 31: Perform
differential-incremental.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Suppose at the end of the month
the client wanted a FULL restoration of all files, by using this method tell
me if this is correct:<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal
style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in; mso-list: l1 level1
lfo2"><![if !supportLists]><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN
style="mso-list: Ignore">1)<FONT face="Times New Roman" size=1><SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></FONT></SPAN></SPAN></FONT><![endif]><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Restore Day 0's full
backup.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal
style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in; mso-list: l1 level1
lfo2"><![if !supportLists]><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN
style="mso-list: Ignore">2)<FONT face="Times New Roman" size=1><SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></FONT></SPAN></SPAN></FONT><![endif]><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Restore the cumulative backup
from
Day7, Day14, Day21,Day28.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal
style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in; mso-list: l1 level1
lfo2"><![if !supportLists]><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN
style="mso-list: Ignore">3)<FONT face="Times New Roman" size=1><SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></FONT></SPAN></SPAN></FONT><![endif]><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Restore the
differential-incremental backups from
Day29,30,31.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Then I would have fully restored
all of the files, correct?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Please let me know if this makes
sense.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial">Thanks!<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial">Justin.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"><o:p> </o:p></SPAN></FONT></P></DIV></BLOCKQUOTE></BODY></HTML>
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