Confused on Toad's backup

TD
I would much appreciate some clarification of your often repeated instructions which seem simple but I must be missing something basic. I have spent a great deal of time on my photos and would like to safeguard the effort but I don't understand what I need to backup. I am using iPhoto 08. I don't see anything labeled "library6.iphoto". In my home folder I have "iPhoto Library" and when I click on it my library of events opens. Where is the library6.iPhoto file you speak of. Is the backup you speak of actually backing up all the photos or just the test that accompanies the photos. Is the backup simply making an entire duplicate library?
If i spotlight library6.iPhoto I'm told it is in users/my home/iPhoto library but when i open iPhoto library my events appear and there is no library6.iPhoto.
What am I not understanding?
Many thanks,
Jake

Jake:
The file is located inside the iPhoto Library package.
To open the package to look in side, look but do not rename, move or remove any files or folders, follow this screenshot:
As long as your library is titled iPhoto Library and is located in your Pictures folder the application will find and make a backup copy to the Pictures folder and label it Orange. Each time you run the app it will overwrite the current backup copy in the Pictures folder.

Similar Messages

Now that I have backed up, can I delete items from my desktop? One of the reasons I got the time capsule was so that I could free up some space on my computer. I am confused about whether the backup will one day remove my photos/video

I purchased a 2TB time capsule yesterday. I set it up as a router and did the backup no problem. I then navigated the backup folder and found that all my photos/video that I am nervous about losing are on there. So far so good.
Taking a step back, the reason I bought the time capsule was 1.) I needed a router 2.) I have a mac and 3.) I am running out of disk space on that mac (I shoot and cut a lot of video and have years of high quality pictures on my mac hard drive)
Can I now delete them from my mac computer to free space? I have used standard external disk drives in the past, but the whole "Back Up" piece of things has me confused. I love the idea of backing up my computer so I want to keep that functionality, but will the drive still function as a static external hard drive? Or do I need to move that material in seperately as a folder outside of the backup folder?
I am nervous that if the backup overwrites information as the disk space becomes limited that in 10 years when I fill this drive up, that I will lose all of my photos that are part of the backups that I am running now.....
Or worse, I am nervous that if I remove things from my mac right now, that the next time that a back up is performed that it will lose this data as it is not currently on the device I am backing up? How does this work?
I apologize, the back up is a very new concept to me and I want to make sure I do not goof anything up.

applefool wrote:
Taking a step back, the reason I bought the time capsule was . . . 3.) I am running out of disk space on that mac
That's an entirely different thing from backups. A backup is an extra copy, in case the original is lost or damaged.   Additional space is just that -- more space for originals.
While it's possible to use the same disk (such as the TC's internal HD) for both things, it's dangerous -- when (not if) something happens to the TC, you risk losing the originals that are on it.   To be safe, you need (at least) two copies of everything important, in (at least) two different places.
Many (including me) recommend at least three copies (originals plus 2 backups). While it's not common for the Mac's hard drive to fail about the same time as the backup drive, it does happen. There are several threads here where it did, and very expensive data recovery was needed, but in some cases everything was lost.
So as the others recommend, getting an external HD for the stuff there isn't room for on your Mac is one solution for not having enough space. But you might explore getting a larger internal HD.   If possible, that might be bettter.
Then, also get another external, for "secondary" backups, so you're doubly protected. If you get a portable model, you can take it offsite for even better protection. See #27 in Time Machine - Frequently Asked Questions for details and some suggestions.
Can I now delete them from my mac computer to free space? I have used standard external disk drives in the past, but the whole "Back Up" piece of things has me confused.
You're not the first or only one.
There are different types of backup apps, so there are different answers for the different types.
As the others have posted, Time Machine will, sooner or later, delete it's backup copies of things that are no longer on your system. Depending on how long the original was there and when backups were run, that can be in as little as 24 hours, or as long as there's room.   So no, don't take the chance with data that's important!
Is there helpful information on how to add an external drive to your backup set up?
See the green box in #2 of the FAQ article. All you have to do is format it for a Mac and remove it from the exclusion list.
           Once I set it up, will I need to leave the hard drive plugged into my mac in order for the data to be backed up?
It can only be backed-up while it's connected.
           If I do, and a back up is performed without the hard drive attached to my computer, will it remove the backup of what was on the hard drive
No (unless you leave it disconnected until Time Machine starts deleting old backups).
It will back up the external when it's connected, and not complain if it isn't.

Confusion with Time Capsule backup

I'm a bit baffled as how to set up Time Capsule as a backup drive. Came from the store with it two days ago (2011 version, latest FW)
First of all the Time Capsule drive appears twice in the list of available drives in Time Machine's panel. I understand that this is a feature in Mountain Lion, so okay.
But, I do not want the backup drive available as file share as I have plenty of disk space available elsewhere. If I turn it off in Airport Utility's disc tab, the drive disappears completely in the Time Machine panel and it simply cannot find any backup drive whatsoever. Untill I enable file sharing again.
Is it supposed to be this way?
Second, I have two Macs connected to Time Capsule. One Mini (on ethernet, ML) and a MacBook Pro (wifi & ML - both 2011). On the Mini, a couple of times today I have been asked to type in the password for Time Capsule.local.
What is is and why is it necessary? And even if I have saved the password to the key chain I still get asked the question again.
And about an hour ago, nor the Mini or the MBP was able to find the backup drive, and I had to remove it and select it again in Time Machine for backup to work.
If things are not as they are supposed to be, I don't think this is a hw issue, so could this be a ML compatibility issue?

Hmm. It seems to have fixed itself... it just took 50 minutes to successfully complete the backup.

Some confusion about Time Machine backup mechanism for duo systems

I want to install an addtional SSD as a replacement for the Superdrive,and was planning to make a clean installation of Mountain Lion on that SSD and keep the original Lion System in the HDD intact.
But that raised a question for the Time Machine.
Can I use the original time machine backup partition of my external drive to backup both drives? If this can be done,wil the new contents in the mountain lion be backed up incrementally to the external drive or it will overwrite the drive?
Can I use either time machine to backup both HDD and SSD,or I have to back them up seperately from two systems?
As that external drive is the only backup destination I have, try these stuff seems risky, so, can anyone help?
Thanks

Can I use the original time machine backup partition of my external drive to backup both drives?
Yes.
If this can be done,wil the new contents in the mountain lion be backed up incrementally to the external drive or it will overwrite the drive?
Time Machine creates a series of snapshots of each volume it backs up. A snapshot is created by backing up only the files that have changed since the last snapshot was taken. In that sense, it's incremental.
Can I use either time machine to backup both HDD and SSD...?
Yes.

Oracle Hot Backup Confusion

Hi everybody,
This is regarding a confusions on Oracle Hot-Backup.
Suppose i have 3 Online Redo Logs and i have put a tablespace in Backup Mode.
So as a result whatever changes are made,Oracle will start generating redo for the entire block so as to avoid Fractured Blocks.
Wat my Question is what if,while in the process of doing this all my Online Redo Logs files/members gets filled up how do then Oracle Manage to go ahead and keep recording the Transactions/Changes made to a Certain Block in the Tablespace.
1.>Does Oracle Perform a Recovery from the Archived Redo Logs once the Tablespace taken out Backup Mode.
2.>Or is there a reclamation/Re-sizing of On-line redo log file Space from other Segments.
Thanks & Regards,
Prosenjit Mukherjee.

>
I am not even sure that what the #2 means! Anways!
Suppose i have 3 Online Redo Logs and i have put a tablespace in Backup Mode.It doesn't matter how many redo log groups you have and AFAIK this has no relation with a tablespace being in the backup mode whatsoever.
So as a result whatever changes are made,Oracle will start generating redo for the entire block so as to avoid Fractured Blocks.Partially correct! The whole block gets copied only for the first time . For subsequent changes, only the change vectors go into the log buffer and then from there, to the redo log files. This is exactly equivalent to what does happen without a tablespace being not in the backup mode.
Wat my Question is what if,while in the process of doing this all my Online Redo Logs files/members gets filled up how do then Oracle Manage to go ahead and keep recording the Transactions/Changes made to a Certain Block in the Tablespace.What does this mean exactly? If you fill up the redo logs, log switch will follow making teh LGWR switching from the current redo log group to the next, triggering checkpoint which would make the DBWR write the buffers to the datafile. I am not sure what is the confusion?
Edit: I apologize , I read this point a little too fast! If all the log files are going to be filled up, database would be hung. There won't be any more transactions allowed as there is no place to write their change vectors anywhere. Sorry , I understood in the first time that you were talking about the standard log switching.
1.>Does Oracle Perform a Recovery from the Archived Redo Logs once the Datafile is taken out Backup Mode.What recovery? Before the files go into the backup, there is a "global checkpoint" that is performed for them , pushing all of their buffers from the cache to them and then after the checkpoint is freezed for them, yet letting them do all the read/write operations. Once they come out of the backup mode, when the next time a checkpoint is performed, then their number gets synched with the rest of the database. From where the recovery comes into the picture here?
2.>Or is there a reclamation/Re-sizing of On-line redo log file Space from other Segments.As I said before, I didn't understand at all what this point even means?
HTH
Aman....
Edited by: Aman.... on Oct 24, 2009 9:19 PM added Edit

DAG - Backup failing on 1 DB only with error - The Microsoft Exchange Replication service VSS Writer instance ID failed with error code 80070020 when preparing for a backup of database 'DB012'

Hi Board,
i´ve search across the board, technet and symantec sites but did not found a hint about my problem.
we drive a 2 node DAG (Location1-Ex1-mb1
Location2-exc1-mb1), on SP2 RU4 patchlevel with 40 Databases.
Since some time the backup of one - and only one DB - is failing with these events, logged on the Mailboxserver on which the passive DB is hosted.
Log Name:      Application
Source:        MSExchangeRepl
Date:          28.09.2012 00:37:17
Event ID:      2112
Task Category: Exchange VSS Writer
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Location1-Exc1-MB1
Description: The Microsoft Exchange Replication service VSS Writer instance 1ab7d204-609a-4aea-b0a7-70afb0db38de failed with error code 80070020 when preparing for a backup of database 'DB012'.
Followed by
Log Name:      Application
Source:        MSExchangeRepl
Date:
01.10.2012 03:33:06
Event ID:      2024
Task Category: Exchange VSS Writer
Level:         Error
Keywords:      Classic
User:
N/A
Computer:      Location1-Exc1-MB1
Description:
The Microsoft Exchange Replication service VSS Writer (Instance 42916d80-36c1-4f73-86d0-596d30226349) failed with error 80070020 when preparing for a backup.
The backup Application - Symantec Backup Exec 2010 R3 – states, this error
Snapshot provider error (0xE000FED1): A failure occurred querying the Writer status.
Check the Windows Event Viewer for details.
Writer Name: Exchange Server, Writer ID: {76FE1AC4-15F7-4BCD-987E-8E1ACB462FB7}, Last error: The VSS Writer failed, but the operation can be retried (0x800423f3), State: Stable (1).
Symatec suggests within http://www.symantec.com/business/support/index?page=content&id=TECH184095
to restart the MS Exchange Replication Service – BUT the mentioned eventID
8229 isn´t present on any of the both Mailboxservers.
The affected Database is active on Location2-Exc1-Mb1 Server and in an overall healthy state. I found during my research, that below Location2-Exc1-Mb1 Server, there are not removed shadow copies present!
This confuses me, since all Backups are normally taken from the passive copy of a Database.
So my questions to the board are:
* Does anyone is facing similar issues?
* Can someone explain why snapshots are present on the Mailboxserver hosting the Active Database, whilst the errors are logged on the passive one?
-          * Does someone know the conditions, why shadows copies remain and
aren´t removed in a proper manner?
What can cause the circumstance, that only 1 DB is facing such issues?
Any suggestion is welcome!
BR
Markus

Hi Lenora,
I´ve encreases VSS / Exchange Backup Log levels to expert, before starting
those things i´ve all tried now:
- Backup from passive DB (forced within Symantec Backup Exec)
- Backup from active DB (forced within Symantec Backup Exec)
- Backup from passive DB without GRT enabled (forced within Symantec Backup Exec)
- Backup from active DB without GRT enabled(forced within Symantec Backup Exec)
All those attempts failed.
But brought some more details - the backup against the active DB states, that there is still a backup in progress and therefore this backup is cancelled by VSS.
The Solution was, that i´ve needed to restart the Exchange Replication Service on the Mailbox Server hosting the passive DB.
Backups are working again on all DBs!
THX for your replys.
Best regards
Markus

Is it possible to backup and restore a U300s to factory defaults?

I've decided to purchase a U300s. Since it doesn't have an optical drive, and therefore does not come with any installation media, I'm a bit confused how I might backup the disk so I can later restore it to factory defaults.
Is there a way to copy the contents of the internal SSD to a USB drive in such a way to allow booting off the USB drive? Is there any way to restore the SSD back to the exact state it was in when it left the factory?
A little more detail...
I plan on installing Linux on the U300s and have no desire to dual boot Windows. Therefore I will be reformatting and using the entire drive for Linux. However, there are some very rare times when I might need to boot into Windows (e.g. installing BIOS updates). Preferably I'd like to have a USB drive collecting dust somewhere that I could boot off of in these rare situations.
I'm wondering if something like this would work:
Boot a new U300s off a live Linux USB flash drive
Use dd to clone the SSD to a portable USB drive
Install Linux
Boot into Windows from the cloned USB drive as needed
Would something like that work? I'd prefer to do this all from Linux because I have very limited experience with Windows (I can barely do anything) but have been using Linux for 15+ years.
Solved!
Go to Solution.

Using the onekey boot recovery software in windows there is an option to backup a factory image of the U300s drive to an external DVD. It's fiddly, but you can use a Virtual DVD burner to accomplish this. I found a free one and set the backup drive size to 8GB or something, then ran the backup telling the onekey recovery to backup to the external virtual drive.
Have a look on this and previous forum pages for some info on how todo this.
Worked a charm
Only problem now I suppose would be recovering from that backup, considering it is far too big to be burnt onto a single DVD. Some combo of virtual drives again and maybe an external USB drive.
Let us know how the Linux install goes.

User managed coldbkp vs rman cold backup

Hi,
I confused about rman cold backup in no catalog mode while restore the backup.please anyone clarify it.
1,I am not confused about user manged cold backup.I took the backup (spfile,control file,redo file,datafile,password file.)Is it right one?
2,In rman cold backup in no catalog mod, we used backup sets for backup,control file is autobackup is enabled.
The backup set format is not OS format.The backup stored at flash recovery area.
Just assume,
I lost all files(spfile,control file,redo file,datafile,password file.)How to recover that.
I am not able to identity spfile & control file in backupset in flash recovery area.
How to identity the spfile,control file during the restoration?
3,Rman takes the copy of online redo file in cold backup?
If it's not,How to recover the database & in user managed backup,copy of online redo log file is must?
4,What is the difference between dbid & sid?when it is used?
5,Can i specifty format for spfile when i take the backup? can i use trace file(control file ) for restoration?
I read the oracle documents, but I am not understand the above things clearly.please anyone rectify it.

user3266490 wrote:
Hi,
I confused about rman cold backup in no catalog mode while restore the backup.please anyone clarify it.
1,I am not confused about user manged cold backup.I took the backup (spfile,control file,redo file,datafile,password file.)Is it right one?
Yes,you are right,but first need SHUTDOWN IMMEDIATE;
>
2,In rman cold backup in no catalog mod, we used backup sets for backup,control file is autobackup is enabled.
The backup set format is not OS format.The backup stored at flash recovery area.
If you do not explicitly configured rman then yes it will backup to FRA.
Just assume,
I lost all files(spfile,control file,redo file,datafile,password file.)How to recover that.
First need SET (EXPORT) ORACLE_SID and then
rman target /
startup force nomount;
restore spfile from 'autobackuplocation';
startup force nomount;
restore controlfile from 'autobackuplocation';
catalog start with 'backupandarchiveloglocation';
restore database;
recover database;
alter database open resetlogs;
I am not able to identity spfile & control file in backupset in flash recovery area.
From rman you can execute LIST BACKUP or LIST BACKUP OF CONTROLFILE;
How to identity the spfile,control file during the restoration?
3,Rman takes the copy of online redo file in cold backup?No,RMAN do not backup online logs,due to this do not need.
If it's not,How to recover the database & in user managed backup,copy of online redo log file is must?
If cold backup then you can open database with resetlogs option and online logs will create automatically(if you did not copy this logs)
>
4,What is the difference between dbid & sid?when it is used?
DBID is unique identify database in recovery catalog and using this you can restore controlfile easily.But SID is ORACLE_SID and identify instance.This is environment variable like ORACLE_HOME
5,Can i specifty format for spfile when i take the backup? can i use trace file(control file ) for restoration?
Yes you can identify format manually for spfile. ALTER DATABASE BACKUP CONTROLFILE TO TRACE ... this statement use to getting script for recreating controlfile again.So this is not backup and you can notuse for restoring controlfile.If you do not have a backup of controlfile and all datafilesd available then you can use this statement.
I read the oracle documents, but I am not understand the above things clearly.please anyone rectify it.All these and with all situation clearly explained below doc
http://download.oracle.com/docs/cd/E11882_01/backup.112/e10642/toc.htm

HT201250 I have two macbooks. Can I backup both machines using timemachine on one external hard drive?

I have two MacBooks, both operating on different OS - Leopard and Snow Leopard. Can they both be backed upusing time machine onto one external hard drive?

J D McIninch wrote:
Actually, it does both. However, if you use two machines with the same name, it can pose a problem. If you mount the Time Machine drive and open the backup db directory, you'll note that the subdirectories are arranged by system name. The information about the ethernet MAC ID is in hidden files.
Yes, as posted, to the user it's confusing (and accessing your backups via the Finder is not recommended).
Time Machine knows which is which, and will back up each Mac to the proper folder. When/if you want to use the "Star Wars" display to view or restore from either Mac's backups, it will show the backups for the Mac you're on.

How do we backup the Appsets in BPC NW7.5

Hi Experts,
I know that BPC data will be stored on the Database but I am confused that how to backup the Appsets and the data on the .NET Server.
If possible can anyone please share the views on this.
Thanks,
Bobby

Hi,
Sorry but right now this functionality is not available in BPC 7.5 NW current version. But we can expect in future versions.
Thanks
Edited by: Sushma Sandepogu on Jun 23, 2010 3:36 PM

Recovery doesn't see old archivelog backups

I am doing weekly full backups
backup
as compressed backupset
channel=disk1
full
database
include current controlfile
plus archivelog
delete all input;
Point-in-time recovery worked fine using:
set until scn $1 ;
restore database;
recover database delete archivelog;
release channel c1;
alter database open resetlogs;
Untill today, when I tried recovering using backupset that is two weeks old.
Restore database worked fine. But media recovery failed with errors like this:
RMAN-03002: failure of recover command at 09/28/2006 21:06:58
RMAN-06053: unable to perform media recovery because of missing log
RMAN-06025: no backup of log thread 1 seq 10992 lowscn 200869768 found to restore
RMAN-06025: no backup of log thread 1 seq 10991 lowscn 200868902 found to restore
database recovery was unable to find archivelog backups.
What was confusing is that 'list backup' would show me the missing backups as available:
BS Key Size Device Type Elapsed Time Completion Time
1653 497.50K DISK 00:00:01 17-SEP-06
BP Key: 1868 Status: AVAILABLE Compressed: YES Tag: TAG2006_09_17
Piece Name: /disk0/oradata/live/LIVE/backupset/2006_09_17/live_2006_09_17_archivelog_mohtfs3a_1_1.bck
List of Archived Logs in backup set 1653
Thrd Seq Low SCN Low Time Next SCN Next Time
1 10992 200869768 17-SEP-06 200870470 17-SEP-06
I tried all what I could think of to get rman to see those backups.
Finally, I changed computer system time to two weeks ago - and recovery worked !
Why is recovery ignoring old archivelog backups ? How to make recovery see those old files ? Is there a more elegant way to recover to a point in time that doesn't require me to change computer clock ? Using 'set until scn' is the standard way I do it but it seems to work only within a certain time frame.

I don't think that's the problem. I use backupsets to create a copy of database on another machine. So, I never (knock on the wood) do recovery of the database that is being backed up.
This is how the script looks like:
set dbid 123123;
startup nomount
run
allocate channel c1 device type disk;
restore controlfile from autobackup maxdays = 100;
alter database mount;
set until scn 7878787;
restore database;
recover database delete archivelog; -- it fails when it gets to this phase, complaining about missing files
release channel c1;
alter database open resetlogs;
}

Can i launch _Daily_ Time Machine backup?

Hi there,
before upgrading from Mavericks to Yosemite, i want to create the latest backup of my MBP13.
Can i selectively launch a backup choosing the Daily Backup, instead of having to wait through the backup of my entire drive?
From Time Machine preference screen, i see this process is pretty much automatic.
So basically, i wonder if there is a way to control the backup process, or is it fully automatic?

If you can consider starting all over again with both the MBP and MBA, the simplest thing to do by far is erase the Time Capsule disk and then start over again with backups from both Macs and move forward.
Few of us ever need all the backups from months, weeks or even days ago, but I do understand that it is difficult to erase them.
Trying to reduce the size of the current backup set on the Time Capsule would take forever and the results are not guaranteed. There is simply no way to do this other than start to manually delete individual backups from Time Machine. After 3-4 hours of work....and very little gain in disk space.....you may likely conclude that this is not for you.
It would certainly be possible to connect a USB drive to the Time Capsule and "point" the backups for the MBA there, so that is an idea. Not sure what you are referring to about Lion in this regard. You may be confused with Time Machine backups to a USB drive at the AirPort Extreme....which is not supported by Apple.
If you elect to backup the MBA to the "new" USB drive, you still will soon be faced with a decision on what to do with the existing backups on the Time Capsule. In theory, Time Machine deletes older backups automatically to make room for new backups. In practice, this does not always work. Then, you have to decide how to proceed at that point.
Bottom line....starting over fresh with both Macs is by far the simplest thing to do. Given the complexities of network issues, the simplest thing is also often the best thing to do.

What does the backup conduit DO?

I'm confused about what the backup conduit does.
In other words if all conduits are set to synchronize, and the backup is set to HH overwrites desktop, what is that backup conduit doing?
I'm not sure if I'm asking the question the right way...I'm just not understanding how it's different than the rest of the conduits, and when it gets "used".
Post relates to: Tungsten T3
This question was solved.
View Solution.

the backup conduit backs everything else up. That's kind of the best way to put it, it backs up all ROM files and all of the third party applications you install to the device. If what is on your device doesn't come with it's own conduit such as datebook, address book etc then it is backed up within the backup conduit.
Post relates to: Centro (Sprint)

Question about full backup and Transaction Log file

I had a query will taking full backup daily won't allow my log file to grow as after taking the full backup I still see the some of the VLF in status 2. It went away when I manually took the backup of log file. I am bit confused shall I
perform backup of transaction log and full database backup daily to avoid such things in future also until I run shrinkfile the storage space from server won't get reduced right.

yes, full backup does not clear log file only log backup does. once the log backup is taken, it will set the inactive vlfs in the log file to 0.
you should perform log backup as the per your business SLA in data loss.
Go ahead and ask this to yourself:
If a disaster strikes and your database server is lost and your only option is restore it from backup,
how much data loss can your business handle??
the answer to this question is how frequently your log backup should be?
if the answer is 10 mins, you should have log backups every 10 mins atleast.
if the answer is 30 mins, you should have log backups every 30 mins atleast.
if the answer is 90 mins, you should have log backups every 90 mins atleast.
so, when you restore, you will restore latest fullbackup+differential(latest one taken after restored fullback)
and all the logbackups taken since the latest(restored full or differential backup).
there several resources on web,inculding youtube videos, that explain these concepts clearly.i advice you to look at them.
to release the file space to OS, you should the shrink the file. log file shrink happens from the end upto the point it reaches an active vlf.
if there are no inactive vlf's in the end,despite how many inactive vlf's the log file has in the begining, the log file is not shrinkable
Hope it Helps!!

Film rolls are missing

One of my iPhoto libraries has film rolls missing and rebuilding thumbs and database did not help. I can see the original photos in the iPhoto library on the hard drive though, so I would not want to reimport. Is there a way to show the film rolls again without re-importing?
Thanks,

Since the original photos are still in the iPhoto
library, (even if I drag the folder to the desktop),
how do I avoid having a second set of the same photos
when I re-import them into that iPhoto library? Can I
select Preferences-Advanced and tick NOT import
photos into iPhoto library? In this way, it will give
me an alias pointing back to the existing library,
give me my film rolls back, but no dupes?
After dragging to the desktop it is necessary to go in iPhoto and delete the remains from there. I was going on the assumption (correct me if I am wrong) that the photos from the missing rolls have either thumbnails or empty boxes in the iPhoto window. Delete them in iPhoto, then empty iPhoto trash before you reimport. Otherwise, iPhoto won't recreate their thumbnails and the reimport will not work.
I don't believe that creating an alias will help, because it won't fix the link that has been broken. Plus, it will add more confusion to your library.
Thank you all for your help. Thing is that I
understand that they will have to be re-imported if
the rolls are missing, but WHY are the rolls missing?
I don't know. It usually results from user activity in the iPhoto library folder from within Finder. The simple act of renaming a roll's folder in Finder will cause iPhoto to be unable to access all of the files stores inside that roll. If you haven't done that, then it's a mystery. [I had gremlins that rearranged my files during my upgrade from iPhoto 5 to iPhoto 6. Modified files traded places with Originals, some files were missing from Originals but present in Modified-it was weird. I used this method to sort everything out and haven't had a problem since the upgrade.]
I use iPhoto Buddy to select my iPhoto libraries (I
have about 10 libraries) and one of those libraries
was corrupted (due to overloaded photobook I think),
but the iPhoto library in question, that I was not
using, has film rolls missing when I opened the
library. (I'm afraid this is going to get contagious
and affect my other iphoto libraries too!)
I haven't seen other reports of iPhoto Buddy breaking connections like this, but I don't use it so I can't really speculate. I would expect to see lots of complaints if this happened very frequently at all.
For the future, keep a current backup of the Library6.iPhoto file for each of your libraries. It is located inside the iPhoto library folder; Duplicate it in Finder and move the copy. This is the database file which contains the metadata about albums, rolls, keywords, etc. If your database fails in the future you can simply replace this file with the backup to restore your library. I take this advice from Old Toad and backup the file every time I close iPhoto.

Confused on Toad's backup

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