Estimating the backup size before running the RMAN

DB Version : 11.2
OS : Oracle Solaris 10
I need to take an ad-hoc RMAN cold backup of a 200GB DB to Local Disk. Using RMAN, is there any way I could check how much the backup size would be before I take the cold backup ?

Read the metalink How to estimate the size of an RMAN database backup [ID 1274720.1].

Similar Messages

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.

Estimating The Database Size before build up

Hi,
how can i estimate oracle database size before building up. is there any query or formula there to estimate the size.
i read a thread of Sir. Joel Pérez if he is available then i m requesting him to send me that docs that you are posted for the estimation query.
my mail is [email protected]
Regards
Avnish

Use the DBMS_SPACE built-in package to estimate table and index cost (size).
http://www.psoug.org/reference/dbms_space.html

Estimating the backup size for full database backup?

How to estimate the backup file size for the following backup command?
Oracle 10g R2 on HPUX
BACKUP INCREMENTAL LEVEL 0 DATABASE;
Thank you,
Smith

Depends on the number of used blocks, block size etc. You could probably get a rough formula for backup size based on the contents of dba_tab_statistics (subtract empty_blocks), dba_ind_statistics etc.

Need help in the RMAN backup

Hi everybody
What are the steps needed if move the RMAN backup to other location in the OS level
(ie) every week i have to move the backup to other location

There are not problem for example:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\comp>set ORACLE_SID=W
C:\Documents and Settings\comp>sqlplus "/as sysdba"
SQL*Plus: Release 10.2.0.2.0 - Production on Mon Apr 26 14:53:08 2010
Copyright (c) 1982, 2005, Oracle. All Rights Reserved.
ERROR:
ORA-01031: insufficient privileges
Enter user-name:
C:\Documents and Settings\comp>sqlplus "sys/sm as sysdba"
SQL*Plus: Release 10.2.0.2.0 - Production on Mon Apr 26 14:53:15 2010
Copyright (c) 1982, 2005, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> archive log list;
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 12
Current log sequence 14
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 125829120 bytes
Fixed Size 1288100 bytes
Variable Size 71305308 bytes
Database Buffers 46137344 bytes
Redo Buffers 7098368 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> alter databaseop;
alter databaseop
ERROR at line 1:
ORA-00940: invalid ALTER command
SQL> alter database open;
Database altered.
SQL> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Pr
oduction
With the Partitioning, OLAP and Data Mining options
C:\Documents and Settings\comp>rman target sys/sm
Recovery Manager: Release 10.2.0.2.0 - Production on Mon Apr 26 14:55:58 2010
Copyright (c) 1982, 2005, Oracle. All rights reserved.
connected to target database: W (DBID=754336873)
RMAN> backup database;
Starting backup at 26-APR-10
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=144 devtype=DISK
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00001 name=D:\ORACLE\PRODUCT\10.2.0\ORADATA\W\SYSTEM01.DBF
input datafile fno=00003 name=D:\ORACLE\PRODUCT\10.2.0\ORADATA\W\SYSAUX01.DBF
input datafile fno=00005 name=D:\ORACLE\PRODUCT\10.2.0\ORADATA\W\EXAMPLE01.DBF
input datafile fno=00002 name=D:\ORACLE\PRODUCT\10.2.0\ORADATA\W\UNDOTBS01.DBF
input datafile fno=00004 name=D:\ORACLE\PRODUCT\10.2.0\ORADATA\W\USERS01.DBF
channel ORA_DISK_1: starting piece 1 at 26-APR-10
channel ORA_DISK_1: finished piece 1 at 26-APR-10
piece handle=D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\W\BACKUPSET\2010_04_26
\O1_MF_NNNDF_TAG20100426T145611_5XBRSX1M_.BKP tag=TAG20100426T145611 comment=NON
E
channel ORA_DISK_1: backup set complete, elapsed time: 00:01:34
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
including current control file in backupset
including current SPFILE in backupset
channel ORA_DISK_1: starting piece 1 at 26-APR-10
channel ORA_DISK_1: finished piece 1 at 26-APR-10
piece handle=D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\W\BACKUPSET\2010_04_26
\O1_MF_NCSNF_TAG20100426T145611_5XBRWXG2_.BKP tag=TAG20100426T145611 comment=NON
E
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:05
Finished backup at 26-APR-10
RMAN> crossckeck backupset;
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00558: error encountered while parsing input commands
RMAN-01009: syntax error: found "identifier": expecting one of: "allocate, alter
, backup, beginline, blockrecover, catalog, change, connect, copy, convert, crea
te, crosscheck, configure, duplicate, debug, delete, drop, exit, endinline, flas
hback, host, {, library, list, mount, open, print, quit, recover, register, rele
ase, replace, report, renormalize, reset, restore, resync, rman, run, rpctest, s
et, setlimit, sql, switch, spool, startup, shutdown, send, show, test, transport
, upgrade, unregister, validate"
RMAN-01008: the bad identifier was: crossckeck
RMAN-01007: at line 1 column 1 file: standard input
RMAN> crosscheck backupset;
using channel ORA_DISK_1
crosschecked backup piece: found to be 'EXPIRED'
backup piece handle=D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\W\BACKUPSET\201
0_04_26\O1_MF_NNNDF_TAG20100426T145611_5XBRSX1M_.BKP recid=1 stamp=717346573
crosschecked backup piece: found to be 'EXPIRED'
backup piece handle=D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\W\BACKUPSET\201
0_04_26\O1_MF_NCSNF_TAG20100426T145611_5XBRWXG2_.BKP recid=2 stamp=717346669
Crosschecked 2 objects
RMAN> delete expired backupset
2> ;
using channel ORA_DISK_1
List of Backup Pieces
BP Key BS Key Pc# Cp# Status Device Type Piece Name
1 1 1 1 EXPIRED DISK D:\ORACLE\PRODUCT\10.2.0\FLASH_R
ECOVERY_AREA\W\BACKUPSET\2010_04_26\O1_MF_NNNDF_TAG20100426T145611_5XBRSX1M_.BKP
2 2 1 1 EXPIRED DISK D:\ORACLE\PRODUCT\10.2.0\FLASH_R
ECOVERY_AREA\W\BACKUPSET\2010_04_26\O1_MF_NCSNF_TAG20100426T145611_5XBRWXG2_.BKP
Do you really want to delete the above objects (enter YES or NO)? y
deleted backup piece
backup piece handle=D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\W\BACKUPSET\201
0_04_26\O1_MF_NNNDF_TAG20100426T145611_5XBRSX1M_.BKP recid=1 stamp=717346573
deleted backup piece
backup piece handle=D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\W\BACKUPSET\201
0_04_26\O1_MF_NCSNF_TAG20100426T145611_5XBRWXG2_.BKP recid=2 stamp=717346669
Deleted 2 EXPIRED objects
now i copy all backup to c:\db
then
RMAN> catalog start with 'c:\db';
searching for all files that match the pattern c:\db
List of Files Unknown to the Database
=====================================
File Name: C:\db\O1_MF_NCSNF_TAG20100426T145611_5XBRWXG2_.BKP
File Name: C:\db\O1_MF_NNNDF_TAG20100426T145611_5XBRSX1M_.BKP
Do you really want to catalog the above files (enter YES or NO)? y
cataloging files...
cataloging done
List of Cataloged Files
=======================
File Name: C:\db\O1_MF_NCSNF_TAG20100426T145611_5XBRWXG2_.BKP
File Name: C:\db\O1_MF_NNNDF_TAG20100426T145611_5XBRSX1M_.BKP
RMAN> list backupset;
List of Backup Sets
===================
BS Key Type LV Size Device Type Elapsed Time Completion Time
1 Full 592.76M DISK 00:01:26 26-APR-10
BP Key: 4 Status: AVAILABLE Compressed: NO Tag: TAG20100426T145611
Piece Name: C:\DB\O1_MF_NNNDF_TAG20100426T145611_5XBRSX1M_.BKP
List of Datafiles in backup set 1
File LV Type Ckp SCN Ckp Time Name
1 Full 947689 26-APR-10 D:\ORACLE\PRODUCT\10.2.0\ORADATA\W\SYSTEM01.
DBF
2 Full 947689 26-APR-10 D:\ORACLE\PRODUCT\10.2.0\ORADATA\W\UNDOTBS01
.DBF
3 Full 947689 26-APR-10 D:\ORACLE\PRODUCT\10.2.0\ORADATA\W\SYSAUX01.
DBF
4 Full 947689 26-APR-10 D:\ORACLE\PRODUCT\10.2.0\ORADATA\W\USERS01.D
BF
5 Full 947689 26-APR-10 D:\ORACLE\PRODUCT\10.2.0\ORADATA\W\EXAMPLE01
.DBF
BS Key Type LV Size Device Type Elapsed Time Completion Time
2 Full 6.80M DISK 00:00:04 26-APR-10
BP Key: 3 Status: AVAILABLE Compressed: NO Tag: TAG20100426T145611
Piece Name: C:\DB\O1_MF_NCSNF_TAG20100426T145611_5XBRWXG2_.BKP
Control File Included: Ckp SCN: 947720 Ckp time: 26-APR-10
SPFILE Included: Modification time: 26-APR-10
RMAN>

Time Machine wrongly determines the backup size

I have weeks with this issue:
I have a 233Gb capacity hard drive out of which I have only 132Gb being used or what is the same, 101Gb of free space on disk.
When attempting to run Time Machine, either by doing the manual Back Up Now or the scheduled and automatic backups, I get an error which I used not to have before. Time Machine can not complete the backup and I get an error saying something like that "the size of my backup is 530Gb while the backup disk has a capacity of only 300Gb".
Why does TM determines such a big backup size, close to 4 times of what I actually have worth of data ? I have FileVault activated, is this part of the problem ?
Like I said before, it used to work fine some 5 weeks ago, now it simply does not. I have already erased/format my backup HD and still is not working and I have just installed the new Mac OS X 10.5.5 update and still the problem continues.
Thanks in advance for your help.

it could be filevault. try disabling it and see if the problem persists. also, make sure no other drives are connected to your computer. if there are, TM will attempt to back them up unless you add them to TM exclusion lists in TM system preferences->options. if none of this helps it's a bug. 10.5.5 was supposed to fix it according to the support documents but it would not be a surprise if it didn't.

Backup stopped before completing. The process cannot access the file because it is being used by another process

I am working with a client who is attempting to backup to a NAS device
The device is a linksys NSS6000 (Cisco device).
It’s a dual 1Gbit LAN device that supports CIFS / FTP and NFS transfers. It has only 1Gbit lan connected.
The device has 4 * 500 gb sata drives in raid 1 attached.
Cables go from cat 5 to fiber back to cat5. (The NAS is located at a neighboring office) The switches are 1gbit.
Server is a win2k8r1 fully up to date.
When backing up to the NAS device, the following error occurs:
Running backup of volume Local Disk(D:), copied (86%).
Running backup of volume Local Disk(D:), copied (90%).
Running backup of volume Local Disk(D:), copied (94%).
Running backup of volume Local Disk(D:), copied (98%).
Backup of volume Local Disk(D:) completed successfully.
Backup stopped before completing.
Summary of backup:
Backup stopped before completing.
The process cannot access the file because it is being used by another process.
If we redirect the backup to a folder on a 2008 share, the backup completes successfully.
Only when backing up to the linksys NSS6000 does the error occur.
No other backup processes are writing to the NAS device so I can't understand why the process thinks the file is
being used by another process.
One thing we did notice that when the backup to the NAS device occurs, throughput is about 150 mbit average
On the 2008 server shares we successfully backup to, the through put is 500 mbit. Not sure if that is important, but
might be worth mentioning.
The following event log entry was noted at the end of the backup.
The description for Event ID '519' in Source 'Microsoft-Windows-Backup' cannot be found.
The local computer may not have the necessary registry information or message DLL files to display the message,
or you may not have permission to access them. The following information is part of the
event:'2009-05-12T10:13:31.617Z', '', '2147942432', '%%2147942432'
Any ideas?
Thanks..Michael

I am also seeing the same problem backing up nightly to a brand new NAS device (WD My Book Live)
All the error codes are the same as those in this thread.
From Windows Event Viewer:
The backup operation that started at '‎2011‎-‎03‎-‎25T06:00:19.811302700Z' has failed with following error code '2147942432' (The process cannot access the file because it is being used by another process.). Please review the event details
for a solution, and then rerun the backup operation once the issue is resolved.
Fault bucket 659897467, type 5
Event Name: WindowsBackupFailure
Response: Not available
Cab Id: 0
Problem signature:
P1: Backup
P2: 6.1.7600
P3: 0x80070020
P4: 7
P5:
P6:
P7:
P8:
P9:
P10:
Attached files:
C:\Windows\Logs\WindowsBackup\WindowsBackup.1.etl
These files may be available here:
C:\ProgramData\Microsoft\Windows\WER\ReportArchive\NonCritical_Backup_6957d65de91fc4a853ecc7c78914bf7351fff0d1_14578325
Analysis symbol:
Rechecking for solution: 0
Report Id: dd480bf2-56a6-11e0-ae81-00217099bf56
Report Status: 0
From Report.wer in C:\ProgramData\Microsoft\Windows\WER\ReportArchive\NonCritical_Backup_6957d65de91fc4a853ecc7c78914bf7351fff0d1_14578325
Version=1
EventType=WindowsBackupFailure
EventTime=129455071508181139
Consent=1
UploadTime=129455071508201140
ReportIdentifier=dd480bf2-56a6-11e0-ae81-00217099bf56
Response.BucketId=659897467
Response.BucketTable=5
Response.type=4
Sig[0].Name=Operation
Sig[0].Value=Backup
Sig[1].Name=AppVer
Sig[1].Value=6.1.7600
Sig[2].Name=HRESULT
Sig[2].Value=0x80070020
Sig[3].Name=TargetType
Sig[3].Value=7
DynamicSig[1].Name=OS Version
DynamicSig[1].Value=6.1.7600.2.0.0.256.48
DynamicSig[2].Name=Locale ID
DynamicSig[2].Value=1033
State[0].Key=Transport.DoneStage1
State[0].Value=1
State[1].Key=DataRequest
State[1].Value=Bucket=659897467/nBucketTable=5/nResponse=1/n
FriendlyEventName=WindowsBackupFailure
ConsentKey=WindowsBackupFailure
AppName=Windows host process (Rundll32)
AppPath=C:\Windows\System32\rundll32.exe
ReportDescription=Windows Backup failure

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

How to set the Rman backup parameter.

Hi,
Can U guide me how to set the Rman backup path,control file auto backup & others parameter.

Hi,
Go through this,
Show all configurable settings:
RMAN>SHOW ALL;
Write disk backups to the /rmanback directory: (%U will be replaced with unique filenames)
RMAN> CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT '/rmanback/%U';
Backup using a flash recovery area rather than disk
RMAN> CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT CLEAR;
Configure RMAN to back up the control file after each backup
RMAN> CONFIGURE CONTROLFILE AUTOBACKUP ON;
By default, RMAN automatically names control file backups and stores them in the flashrecovery area.
To configure RMAN to write control file backups to the /backup directory:( %F will generate a unique filename)
RMAN> CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/backup/controlfile%F';
Ensure that RMAN retains all backups needed to recover the database to any point in time in the last 7 days:
RMAN> CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS;
Retain three backups of each datafile:
RMAN> CONFIGURE RETENTION POLICY TO REDUNDANCY 3;
Delete backups no longer required by the retention policy:
RMAN> DELETE OBSOLETE;
To override the configured retention policy for individual backups - use BACKUP.. KEEP (or CHANGE.. KEEP)
Configure backups to run in parallel by assigning two sbt channels:
RMAN> CONFIGURE DEVICE TYPE sbt PARALLELISM 2;
Reset any CONFIGURE setting to its default by running the command with the CLEAR option
RMAN> CONFIGURE CHANNEL DEVICE TYPE sbt CLEAR;
RMAN> CONFIGURE RETENTION POLICY CLEAR;
Regards,
oraclekt
Edited by: oraclekt on Sep 1, 2010 9:58 PM

Automating refreshing one system with the rman hot backup copy from another

Hi Apps DBAs,
Right now we have two systems: production (OPEBSN) and production support (FINSUP).
I implemented a cronjob, which can refresh FINSUP every night from the cold backup of production. We shutdown the production system at night.
But our istore on production will go live soon and our production system will run 24*7.
The production is already hot backed up from RMAN.
Is it possible to do the following?
Automating refreshing FINSUP from the RMAN hot backup of OPEBSN?
If it is possible, would you please outline the general idea or give me a reference documentation?
If it is not possible, is there any other way to realize our purpose?
Thank you in advance!
Lily

There is some discussion about this topic in the belwo askTom thread.
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:21934468026100
Sam
http://appstech-sam.blogspot.com

Need the rman backup sequence in taking the backup

Hi,
I just need the sequence in taking the backup of full database through rman.
Current method
1. Datafiles
2. Archivelog files
3. Control file.
But I am noticing missing of some archive log when i am doing the recovery files. So, i just want to change my nightly backup to the below procedure
1. datafiles
2. control files
3. archivelog files.
Correct me, the suitable procedure for scheduling.
Thanks,
Ramesh G
Edited by: user13095767 on Sep 7, 2012 9:02 PM

Let me explain my question once again..
I didn't get my requirements..
Recently, faced a scenario while recovery my database...
I am having nightly scheduled backup in the below manner...
1. database backup.
2. archive log files backup
3. control file backup.
My archive log files backup completed by 22:10. and my control file backup completed by 22:29. In between there was an archive generated at around 22:15.
i want to restore and recover the database with this backup. Followed the below scenario
1. restored the controlfile
2. restore database
3. recover database
Finally, it is asking for the archive generated at 22:15 and at 22:49.
So, by this i came to know that my database backed up with missing of archives. if i go with the below scenario of taking the backup
1. datafiles
2. control files
3. archive log files
Thinking that the archive log files backup pieces infomation will not be available in the controlfile..
Which one will be the best option in scheduling our backups.
Taking controlfile backup before archivelog or taking archivelog backup and then the controlfile.
Thanks,
Ramesh G

How to check the file size before loading it to the context

Hello,
I have an application to upload a file and write it to the server using the FileUpload UI and IWDResource Interface.
I would like to limit the size of the file the user is uploading to, say, 2MB.
The problem is that the current API doesn't allow me to check the file size before I store it in IWDResource. The API available for IWDResource:
IWDResource resource = ...
InputStream stream = resource.read(false);
size = stream.available();
Is working on the file only AFTER storing it in the context and the server's memory. This way, if a user decides to upload 1GB file for example, he can easily crash the server.
I am already familiar with <a href="https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/00062266-3aa9-2910-d485-f1088c3a4d71">this</a> arcticle but it doesn't answer this question as well, all it does is calculating the file size only after storing it in the context.
Any ideas...?
Roy

Hi Ram,
Have you activated your Objects ?
You need to activate your objects in order to see them in RWB.
Thanks & Regards,
Varun Joshi

I have to back up the disc before running Bootcamp?

I need to run Windows on my computer by tomorrow morning for a job.
I'm working on a MacBook Pro (Mac OX S version 10.6.8).
I am very computer illterate and was told to set up Bootcamp.
When I try to start up Bootcamp it gives me two options before proceeding:
Download the Windows Support software for this Mac.
I have the Mac OS X installation disc that came with my Mac or I have already downloaded the Windows support softer for this Mac to a CD, DVD, or external disk.
I keep choosing the second option because when I choose the first option I am given an error that reads, "The Window Support Software is not available."
When I choose the second option I get an error that reads, "Back up the disk and use Disk Utility to format it as a single Mac OS Extended (Journaled) volume. Restore your information to the disk and try using Boot Camp Assistant again."
I don't know how to do - I don't have an external hard drive, however, most my files are stored on flashdrives and Dropbox (just in case my computer ever happens to crash).
So basically, can someone walk me through how to set this up? It's a bit of an emergency.
I've tried looking up solutions to this problem but become a bit overwhelmed (like I said, "computer illiterate") and can't follow along with the advice.
If anyone could write a possible solution in a kind of step-by-step format, then I'd be very grateful.
Thank you so~ much to anyone who may reply.

That error message tells you that you have more than one partition on your hard disk, so you have to delete it before running Boot Camp.
1. First of all, if you have important data on that volume, copy it to the first partition before doing anything. You can access to that volume on Finder sidebar.
2. Open Disk Utility, select your hard disk at the top of the sidebar and go to Partition tab.
3. You will see a partitions bar with all the partitions of your hard disk. Select the last partition and press - button to delete it.
4. Then, click at the bottom right corner of the first volume and drag it to the end of the bar, so your OS X partition will use all the space of the hard disk. Finally, press Apply.
5. Close Disk Utility, open Boot Camp Assistant and follow the steps to install Windows.
I give you some notes for the Windows installation:
Boot Camp will create a FAT partition; however, Windows Vista and Windows 7 requires a NTFS partition, so on the partitioning screen (it will appear during the Windows installation), you have to select "BOOTCAMP" volume, press "Options" and choose "Format". When it finishes, press "Next" and Windows installation will start.
After installing Windows, you have to install the Boot Camp drivers. Just insert the Snow Leopard DVD and follow the steps to install the drivers. They will give compatibility for all the hardware of your Mac, so you won't have any problem with Windows.
After installing Windows, your Mac will always start into Windows by default. If you want to start into OS X, press X key while your Mac is starting. If you want to start always into OS X, press X key while your Mac is starting, open System Preferences > Startup Disk, and choose "Macintosh HD".
If you do this last step, to start into Windows, you only have to press Option key while your Mac is starting and choose "Windows".
If you want all the detailed steps to install Windows, you can print this PDF > http://manuals.info.apple.com/en_US/Boot_Camp_Install-Setup_10.6.pdf

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.

HT4818 I want to have an exFAT parition in addition to the Mac OS X and Windows partition. If I create it before running BootCamp, it wants me to delete it. If I create it in either Windows or Mac OS X afterwards, I can no longer dual boot.

I want to have an exFAT parition in addition to the Mac OS X and Windows partition. If I create it before running BootCamp, BootCamp wants me to delete it before continuing. If I create it in either Windows or Mac OS X after running BootCamp and installing both OSes, I can no longer dual boot. What is the magic sequence to get this to work?

I've got the same quandary.
After upgrading my hard drive to a Momentus XT Hybrid and doing a clean install of Mountain Lion, I was surprised that I couldn't format partitions separately and then restore from my clone of the old Windows 7 Partition. I found that I had to use the BootCamp Assistant to manage it all, which essentially meant getting rid of the partitions and starting again...
I now can't get my Windows / BootCamp partition to boot, after adding a 3rd, ExFat, partition, when it was working perfectly fine before. I just get a lot of dos booting failures and a final message that "No boot device is available, press Enter to continue".
See the attached message, that I get when trying to boot the bootcamp partition, through Parallels 7; which also worked perfectly fine before.
Be good to know if there is a work around this in Mountain Lion as, if not, I'm thinking I might skip Bootcamp altogether and just install a machine drive via Parallels. As suggested here:
http://forums.macrumors.com/showthread.php?t=1420754
I might even keep the virtual windows machine on a separate hard drive and then I'll have no need for the ExFat partitions altogether as that was designated for sharing between Windows and Mac.

Estimating the backup size before running the RMAN

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