Backup Size Oddity

I have an internal drive showing 120GB used. I have set up exclusions and under the exclusions list (in which the excluded items add up to 50GB), the estimated full backup size shows as 70GB as I'd expect. However, after my initial backup, the Time Machine drive shows 3GB used not the 70GB I was expecting. Any suggestions as to why it's only backing up this small amount?

Time Machine does automatically exclude some things, such as system work files, most caches and logs, trash, etc. Usually those don't add up to more than a few GBs, though.
So there are two possibilities: you have about 67 GB of that sort of stuff; or there's a problem with Time Machine.
What have you excluded? It's usually not a good idea to exclude much, as it can make recovery after a hard drive or other failure much more difficult. See #11 in [Time Machine - Frequently Asked Questions|http://web.me.com/pondini/Time_Machine/FAQ.html] (or use the link in *User Tips* at the top of this forum).
You can use the "Star Wars" display per #15 in the FAQ to see what was backed-up; you may want to spot-check what you expect to be there. If such things aren't there, the preferences file (where the exclusions are stored) may be corrupted. Try a "full reset" of Time Machine, per #A4 of [Time Machine - Troubleshooting|http://web.me.com/pondini/Time_Machine/Troubleshooting.html] (or use the link in *User Tips* at the top of this forum).
If that doesn't fix it, add-up the sizes of the visible folders on your system; that should be fairly close to the 120 GB that's shown as used on your internal HD. If you have multiple users, log on as each one to see the size of that user's home folder, as one user, even an Admin user, won't see the actual size of another user's stuff.
There are some hidden system folders, so the total won't be 120 GB. But it should be within 10 or 20 GB or so.
Post back with your results, and we'll dig a bit deeper if necessary.

Similar Messages

I am trying to update my time machine backup on time capsule, but time machine keeps trying to create an entirely new backup (evidenced by the 200GB backup size). How can I get time machine to modify my old backup rather than create a new one?

I am trying to update my time machine backup on time capsule, but time machine keeps trying to create an entirely new backup (evidenced by the 200GB backup size). How can I get time machine to modify my old backup rather than create a new one?

It must have found the old backup corrupt.. so you will more than likely have little choice. You can archive off the old backup if it is still useful.
You can also verify it. See A5 http://pondini.org/TM/Troubleshooting.html
He also has some info on this problem. eg C13.

Backup size says 2.0 GB, but I have all backup options turned off. Why is my backup size still 2.0 GB?

I had an iPhone 4 updated to the iOS 7.1.2 version, and I recently purchased an iPhone 5s. When I got the 5s, I transferred all of my camera roll pictures from my 4 to my PC in a file folder and deleted all the photos from my 4 camera roll. I also turned off the "camera roll" backup option in my iCloud storage settings. However, my backup size still said I had a large backup size, so I turned off all the apps in the backup options under the iCloud storage tab. Along with all the apps, I turned off the backup for the Mail, Contacts, Calendars, Reminders, etc. Yet, my backup size on my 4 still said 2.0 GB, and my 5s needs more backup storage without purchasing any extra storage.
I'm not sure if I should completely delete my 4 backup or if there is a solution without completely deleting its backup. If there is a possible solution to decrease my backup size without deleting the backup, what is that solution? If deleting the 4 backup is the best option, what are the "risks" of deleting the backup? Like would I lose anything I restored onto my 5s from the 4 backup, etc.?

Hi girdster,
Thanks for using Apple Support Communities. Based on what you stated, it sounds like you need to manage your iCloud storage. I would recommend that you read this article, This tells you how to manage and how to delete a backup.
Manage your iCloud storage - Apple Support
Cheers,
Mario

Limiting Time Machine backup Size with WD MyBookLive and 10.8

I cannot take credit for the any part of this solution; merely for merging and clarifying how the solutions discovered by 2 Apple Support Communities contributors much smarter than I (namely “Pondini” – Florida and “himynameismarek”) - worked perfectly for my situation. All cudo’s to these two!
I have about average or better PC skills, but am an absolute newbie with Apple. This week I got a new iMac. Having a number of home PC’s all sharing files and back up space on a Western Digital MyBookLive (“WD MBL”) 3TB network drive (NAS), naturally I wanted to use it to backup the new Mac rather than rushing out to buy an Apple Time Capsule.
There are hundreds of threads on limiting size of a Time Machine (“TM”) backup, many of which required entries in “Terminal” or were devised on older versions of OSX. I’m running OSX Mountain Lion 10.8, so was concerned they may not work.
The issues I wanted to resolve were:
Time Machine will use up all of the space on my WD MBL if left to it’s own devices.
The WD MBL is compatible with Mac and PC’s… which is good… but unlike a back up in Windows 7 Pro which will allow you to make backups in a mapped “share” you create yourself, Apple TM Backups will not; they end up in a hidden folder on the NAS (much like PC backups done with WD Smartware)
At first I thought maybe I could limit the size of a share created in the MBL, but not possible, at least not that I've seen and I have searched for days.
The solutions:
First make sure you have the latest firmware for the WD MBL as of today it is MyBookLive 02.11.09-053. From what I’ve read Western Digital fixed the compatibility issues with 10.8 Mountain Lion just recently.
Next you need to start TM so that it starts to create a back up. You can stop the back up once you see files being copied. Do this before you walk thru the video tutorial by my Marek below. WD MBL will create the hidden folder you need to find for TM Backups. This folder is called “TimeMachine” but it is not visible even in the “MBL_NAME-backup” folder in Finder.
Open safari and type “ afp://xxx.xxx.x.xxx ” but use your own ip address of your MBL. Mine was 192.168.1.120, yours will be different.
It will ask how you want to connect. CHOOSE AS A GUEST even if your MBL is protected… I’m not sure why it works but it does. Then a window will come up asking which share you’d like to mount. You will see all of your own shares plus one called software and now one called “TimeMachine”. Choose that one.
Now in “Finder” you will see a mounted shared item called “YOUR_MBL_NAME-“ (the same as the one that is probably already there but with a dash(-) at the end). You’ll also see a new “device” in the device list called “Time Machine Backups” (If you already have watched the video tutorial by Marek, you’d know you are looking for a file called “YOUR_MACHINE_NAME.sparsebundle”. Well if you browse the folder “Backups.backupdb” in the Time Machine Backups device you won’t find it… again I don’t know why but you won’t. It resides in the hidden folder called “TimeMachine” that is now visible in the thing you just mounted in step 4)
NOW watch this video tutorial http://youtu.be/Nq7mSizqUSI and follow it step by step.
Voila... issues resolved. Thank you Pondini and Marek!

Try Use Terminal to limit Time Machine sparcebundle size on timecapsule,
should work to limit Time Machine backup size on any NAS or external disk (or not...)
sudo defaults write /Library/Preferences/com.apple.TimeMachine MaxSize 500000
to return to ilimited
sudo defaults delete /Library/Preferences/com.apple.TimeMachine MaxSize
if you want to reclame deleted files space shrink it use
hdiutil resize -size 500g -shrinkonly /Volumes/TimeMachineYOURNAME/YOURNAME.sparsebundle/
Regards

HT4847 I am only backing up camera roll and a my media app which are 890 MB and 414 MB, i backup everynight why is it full it says my backup size is 4.7 GB when I only have those 2 things?

I am only backing up camera roll and a my media app which are 890 MB and 414 MB, i backup everynight why is it full it says my backup size is 4.7 GB when I only have those 2 things?

The back up is supposed to be a rolling back up and therefore may still contain data from previous back ups. To free up space you may wish to delete the back up and start again.

Big increase in backup size after upgrade

Hello
I've upgraded my database from 10.2.0.4 SE on win2003-SP2 to 11.2.0.1.0 SE on win2008-R2-SP1 64-bit, by doing exp/imp
The databasefiles size sums up to about 150gb on each server
But when I do a normal RMAN database backup of the datafiles on the new database (backup device type disk database;) I get a backupset that is 78 gb in size .
On the old database the backup size was only 36 gb
The data in the two database is about the same, and I dont believe I'm using compression on any of the database backups. I've listet the RMAN paramaters below
Can anybody tell me why I'm seeing this huge increase in backup size?
Best regards
Klaus Mogensen
10g RMAN parameter settings:
CONFIGURE RETENTION POLICY TO REDUNDANCY 2;
CONFIGURE BACKUP OPTIMIZATION OFF; # default
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COMPRESSED BACKUPSET PARALLELISM 1;
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT 'C:\backup\vtrack\backupset\ora_df_%Y_%M_%D_%T_%t_s%s_s%p.bkp';
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO 'D:\ORACLE\PRODUCT\10.2.0\DB_1\DATABASE\SNCFVTRACK.ORA'; # default
11g RMAN parameter settings:
CONFIGURE RETENTION POLICY TO REDUNDANCY 2;
CONFIGURE BACKUP OPTIMIZATION OFF; # default
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'BASIC' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO 'E:\ORACLE\PRODUCT\11.2.0\DBHOME_1\DATABASE\SNCFVTRACK.ORA'; # default

This is why,
Your 10g channel device configuration:
CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COMPRESSED BACKUPSET PARALLELISM 1
Your 11g channel device configuration:
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
Your 10g backups were being compressed, the 11g are not.

How to get Systemstate Backup size using PowerShell command in Windows 2008 R2

Hi,
We using WBSummary command to get completed backup status.
I need to find how much data is backed up using powerShell command .
Is there any way to get the details , i can see the GUI but no in command.
Please advise
Regards Gopi K

Hi,
You mentioned that you can see the system state backup size in the GUI. Does the backup size mean the amount of date transferred?
It seems that there is no such a PowerShell to get Systemstate Backup size. You may need to you need a PowerShell scripts to do this work.
http://social.technet.microsoft.com/Forums/windowsserver/en-US/home?forum=ITCG
Regards,
Mandy
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are trying to better understand customer views on social support experience, so your participation in this
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Thanks for helping make community forums a great place.

Backup size is increased after resync catalog

Hi everyone,
I have describe my problem, if anyone have a solution please provide me.
Rman catalog database version : 10.2.0.1.0, OS : red hat linux
Target database version : 10.2.0.5.0, OS : solaris 10
rman catalog database space is full, then i move my example tablespace to another location, but i forgot to change the ownership of new file.
And I have no backup of my rman catalog database. so i offline the datafile first for opening the rman catalog database after opening the database I have offline the whole example tablespace and this tablespace cannot contain any thing related the catalog.
after that I used the command : crosscheck archivelog all;
DELETE EXPIRED ARCHIVELOG ALL
then i run the command : CROSSCHECK BACKUP;
DELETE EXPIRED BACKUP;
then i run the command : report obsolete;
delete obsolete;
then i run the command : RESYNC CATALOG;
then i run the command : change archivelog all validate;
after doing all the thing when I am taking a backup of archive log by using following command :
run {allocate channel c1 device type disk format '/appl2/prodback_rman/prod_fullbackup/ARCH_%d_%s.bak';
backup archivelog all;
before performing all the above thing my archive backup of whole day is around 5gb but after the above thing my archive backup of one day is around : 126gb
and my level0 backup is alright after and before the above thing and the size is around : 139gb
the script for the full backup is :
run {allocate channel c1 device type disk format '/appl2/prodback_rman/prod_fullbackup/FULL_%d_%s_%c.bak';
backup incremental level 0 database skip offline;
after that I have perform the incremental level 1 backup by using the following script :
run {allocate channel c1 device type disk format '/appl2/prodback_rman/prod_fullbackup/INC1_%d_%s_%c.bak';
backup incremental level 1 database;
before the above activity the size of incremental backup is around : 4.5gb but after performing the above activity the incremental backup size is around : 120gb
it is very critical for me, if any one have the solution please provide me as early as possible.
Thanks & Regards
Rakesh Kumar

Hi Hemant K Chitale,
you said that I am using the COMPRESSED BACKUPSETs till 22-Jan, so I am posting
the rman configuration here that is used before all this happening and same
configuration is used right now.
but before resync catalog the archivelog is generated only one location then I used to archive log
dest for archive log generation then after 5 month I will resync my catalog. may be it is the
reason.
because there are no compressed backupset is defined in the rman configuration.
RMAN> show all;
RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 2;
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/appl2/prodback_rman/prod_fullbackup/ctrl_%F';
CONFIGURE DEVICE TYPE DISK PARALLELISM 2;
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1;
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE CHANNEL 1 DEVICE TYPE DISK FORMAT '/appl2/prodback_rman/prod_fullbackup/prod_%d_%s_%c.bak', '/appl2/prodback_rman/usb/prod_%d_%s_%c.bak';
CONFIGURE MAXSETSIZE TO 20 G;
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/appl2/prodback_rman/prod_fullbackup/snapcf_PROD.f';
Archive log generation log on the daily basis.
SQL> select trunc(COMPLETION_TIME,'DD') Day, thread#,
round(sum(BLOCKS*BLOCK_SIZE)/1048576) MB,
count(*) Archives_Generated from v$archived_log
group by trunc(COMPLETION_TIME,'DD'),thread# order by 1;
DAY THREAD# MB ARCHIVES_GENERATED
04-FEB-13 1 2776 37
05-FEB-13 1 16767 220
06-FEB-13 1 16545 216
07-FEB-13 1 15772 208
08-FEB-13 1 15056 198
09-FEB-13 1 18486 244
10-FEB-13 1 17591 232
11-FEB-13 1 18163 238
12-FEB-13 1 15062 198
13-FEB-13 1 26383 342
14-FEB-13 1 36279 462
DAY THREAD# MB ARCHIVES_GENERATED
15-FEB-13 1 34010 432
16-FEB-13 1 32230 413
17-FEB-13 1 31904 408
18-FEB-13 1 33448 426
19-FEB-13 1 34639 444
20-FEB-13 1 36684 468
21-FEB-13 1 27547 352
right know the archive log backup size by rman is around 19gb per day.
so tell me how we reduce the size of my archive log backup according to
my rman configuration and how can i reduce the archive log generation on
my production server on daily basis.
Thanks & Regards
Rakesh Kumar

DB read_only backup size increase

Hi Experts,
Have below 3 queries. Kindly enough throw some light
1) I have 1 database which is read_only. tlog backup size daily fluctuates how this is possible please...
2)another question related to another problem
backupset table of 1 database shows 65 MB full readonly database backup(named: abcd) daily. here i am somply taking backup from litespeed.
when i run backup database abcd to disk="c:\abcd.bak" with copy_only,checksum,init (in read only mode) it shows size of 57 MB only. Why there's gap as database is in read_only mode.
3) buffercount and maxtransfersize are safe if i have x64bit machine and 100 GB RAM. restore verify completed successfully.
Regards
Manish

1) Why are you taking a backup of a read only database every day ?
Since nothing is changing just stick with the backup you already have. As for fluctuations you may be taking a backup that's added on the latest backup so it'll increase over time.
2) There is no direct correspondence between size in BAK and MDF/LDF. You could have compressed tables or compressed backup, empty space etc etc
3) Changing buffercount and maxtransfersize are safe to change. But first measure for what you gain from changing them since increasing them will have a higher impact on cpu time.
Here are some benchmarks on those:
http://www.mssqltips.com/sqlservertip/2539/options-to-improve-sql-server-backup-performance/
"If there's nothing wrong with me, maybe there's something wrong with the universe!"

RMAN backup with smallest backup size

Oralce 11g2 on Redhat 5. The diskspace is our tightest resource, and we want to an incremental backup with level0 on Sunday and level 1 every week days and Saturday. I am to use the comamnds to do the job--Sunday
backup incremental level 0 tag 'level_0' database plus archivelog;
--Other days
backup incremental level 1 database plus archivelog delete all input;I do not think this is the best practice nor produce smallest backup files.
What are you comments and opinions. Thanks

Pavan, Thank you for reply. Here are the info requested
what is size of DB ??
~250GB, including UNDO and TEMP. It is a dev database and not very big. But we have total 800GB disk space. After setting some housekeeoing folders, and allow some space for data growth, it leaves 180GB for flash_recovery_area.
what would be max size of archive logs generated per day ??
Variable from less than 1 GB to 12 GB
Are you taking backups to tape or Disk ??
Disk. In the 180GB flash_recovery_area, Current backup size is 152GB. If a backup fails to delete obsolete files, the next backup will fill the flash_recovery_area.
Provide the Rman configuration information ??
RMAN> show all;
RMAN configuration parameters for database with db_unique_name TDEV2 are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F';
CONFIGURE DEVICE TYPE DISK PARALLELISM 2 BACKUP TYPE TO BACKUPSET;
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'BASIC' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u01/app/oracle/product/11.2.0/dbhome_1/dbs/snapcf_tdev2.f'; # default

How to reduce the backup size?

HI there,
I am syncing an iPad 32 GB and an iPhone 64 GB via icloud. Photos are not backed, no photostream activated. Apps which are allowed to upload to icloud for backup are very limited. Mail is not syncing to iCloud as well. Still, my backup size is for each device about 2.3 and 2.6 GB big. I want to stay under the 5Gb limit. Any idea, what might take up such a huge amount of backup space? I already deleted the backup via settings --> icloud in each device, but that didn't help much.
Both devices are running the latest iOS.
Thank you very much!

iCloud backup has an on/off switch, so tell me how you think you have managed to exclude things?
FYI, Photostream and Photos are not part of an iCloud backup.
Here’s what iCloud backs up:
Purchase history for music, movies, TV shows, apps, and books Your iCloud backup includes information about the content you have purchased, but not the purchased content itself. When you restore from an iCloud backup, your purchased content is automatically downloaded from the iTunes Store, App Store, or iBooks Store. Some types of content aren’t downloaded automatically in all countries, and previous purchases may be unavailable if they have been refunded or are no longer available in the store. For more information, see the Apple Support article iTunes in the Cloud availability by country. Some types of content aren’t available in all countries. For more information, see the Apple Support article Which types of items can I buy in my country?.
Photos and videos in your Camera Roll
Device settings
App data
Home screen and app organization
iMessage, text (SMS), and MMS messages
Ringtones
Visual Voicemail

Estimate database backup size

Hi All,
AIX 5.3
oracle 10.2.0.3
I have production database of 80 GB. I want to take a cold backup during the upgrade process. Now i want to know database backup size. so we can free space from some mount point accordingly.
Is there any way to estimate database backup size?
Thanks,
Vishal

Question: how did you establish that your database is actually 80G?
Is that 80G of data in the database, or is it the sum of all data files, temp tablespace files, undo tablespace files, redo logs, oracle binary software files, control files, etc?
If you intend to do an upgrade of the software, my recommendation is to shut the database down and do a full copy of:
1) your entire oracle product tree (usually /oracle/product), including ORACLE_HOME.
2) your entire 'oradata' structure which (should) include all of your Oracle database data files and all other associated files.

Backup size too large??

I have been using an external drive for my TM backup for a long time.
Recently I did a reinstall of Snow Leopard on my iMac, then the problem arises.
TM gives the warning of too large backups and not enough disk space in my external drive.
I have tried to erase my TM drive but the problem still exists.
I can see from the TM preferences->option that the "Estimated backup size" is 644 GB
and my TM external drive has 750GB empty space, but the warning msg said I need 775GB of empty space on the ext.
How could it be?? I just have around 600GB of used space on my internal drive to backup!
Can somebody help??

Your backup drive is too small.
It varies greatly, depending on how you use your Mac, but Time Machine usually needs 2-3 times the space of the data it's backing-up to keep a few months of backups for you.
The immediate problem is, Time Machine adds about 20% to the estimated size of the backup, for workspace, as mentioned in the message.
Short term, you can "squeeze" your backups onto that drive by temporarily excluding some large items, per #10 in [Time Machine - Frequently Asked Questions|http://web.me.com/pondini/Time_Machine/FAQ.html] (or use the link in *User Tips* at the top of this forum). Then remove the exclusions, and run another backup. Since the 20% will be added to a much smaller backup, it should fit.
Longer term, you need a much larger disk, preferably 1.5 TB or larger.

Finding correct backup size in sap level

Hi All...
I want to know the successfull backup size in sap level can any one help me out in finding the correct path in detail log in db12 tcode.

Hi,
Are you using brbackup? If yes, go to DB12 -> Overview of database backups -> click on the backup log ID -> Detail log -> and look for "total size" and you'll see something like:
BR0061I 63 files found for backup, total size 1165346.688 MB
Thanks,
Nicholas Chang

SharePoint backup size estimation

How to estimate the size of the database that need to be backup? I read some reference that the size is about 2.5*content database.
How about the backup size using back-spfarm? Is there any compression when backup as bak files? How to set the compression ratio?
So, is the full backup size calculated as 2.5*content database*compress ratio? And what is the differential backup size estimation?
Overall, I need to plan the space required for a weekly full and 5-6 differential backup.
Thanks for providing any ideas that I am not clear.

Hi, we are using a powershell script to calculate the SPSite size in MOSS 2007, same script could work in 2010 and 2013. The result from this + 6 % will return you the ruff size of the backup: It is working for us. Cheers
function Site-Space ($sitecola)
[reflection.assembly]::LoadWithPartialName("Microsoft.SharePoint") | out-null
$sitea = [Microsoft.SharePoint.SPSite]($sitecola)
[int]$sitespacesite = $sitea.Usage.Storage /1MB
$siterecyclebin = $sitea.RecycleBin | Where {$_.ItemState.ToString() -eq 'SecondStageRecycleBin'}
If ($siterecyclebin -ne $null)
ForEach($recycleitem in $siterecyclebin)
[int]$recyclesize = $recyclesize + ($recycleitem.Size /1MB)
$sitespace += ($sitespacesite + $recyclesize)
Else
$sitespace = $sitespacesite
return $sitespace

Backup Size Oddity

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