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backup bigger than original??


emural

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Hello there. I've been backing up progressively my laptop with retrospect backup express. I just noticed my backup files are using 83Gb. I just don't understand how come the backups are so big. My laptop's hard disk is only 60Gb, and it's not even full. I would expect the backup to have less than 50Gb because I'm also using compression. Could somebody please explain me what is going on?

 

Edgar

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Because of the incremental feature of Retrospect backup, your backup file eventually will get larger than the original even though backup is compressed. Make a recycle backup. This will erase the existing backup and start fresh. In Backup, go to Options.

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It would seem Retrospect does not do an "incremental" backup in the accepted sense. In any case, with Retrospect Express, you only have two choices, normal or recycle. I tried posting a link to the following but it didn't work. So here is the full text:

 

 

 

TITLE: Why Retrospect is Better Backup

 

 

 

 

 

--------------------------------------------------------------------------------

 

Discussion:

 

 

 

 

 

Most backup admins in the NT/2000 world perform "full" backups every night. Why? Restore reliability.

 

 

 

When we created Retrospect, we looked at how other file-based backup software worked (Backup Exec, ARCserve, etc.), and we were amazed to see that nothing had really changed since the days of DOS 2.x.

 

 

 

These programs today still rely on the file's archive attribute to determine what to back up in a "new and changed files" backup. Their incremental and differential backups save time and media during the backup process, but they make restoring difficult, and exact restores IMPOSSIBLE. If you did seven incremental backups, then you have to perform seven incremental restores! Good luck!

 

 

 

That's why most anyone who has had to try to rebuild a server from incremental backups now uses a strategy of full backups every night.

 

 

 

Well, Retrospect is smarter than that.

 

 

 

Retrospect can restore any volume in a single pass over the backup media, even though it only performs "new and changed file" backups. This is possible because Retrospect performs a more intelligent method of file selection, ensuring that one copy of each unique file from the source is copied to *each* backup set.

 

 

 

Retrospect doesn't know how to do a "full" or an "incremental" backup.

 

Instead, it always backs up the files that aren't already present in the

 

backup set. When the operator selects a "Recycle" or "New Media" operation

 

in Retrospect, they're only changing the media handling parameters; reuse

 

the same media/backup set or start with a new set of media entirely.

 

 

 

When it's time to restore, Retrospect knows what files were on the source at

 

each backup (from saved Snapshots), so it simply copies all the files from

 

the backup set that are needed to make the source look exactly like it used

 

to at any previous point in time, and only with one restore operation.

 

 

 

Taking this one step further, this design allows Retrospect to keep

 

multiple, complete backup sets, but requiring only one for a restore. Bring

 

a set back from a week in offsite storage, and Retrospect will only copy the

 

files to that set that were created or modified in the last week.

 

 

 

Compared to other Windows backup software, Retrospect gives you the speed

 

and media savings of incremental backups with the reliability and precision

 

of full backups. It has all of the advantages of both, with none of the

 

disadvantages.

 

 

 

**************************************************************************

 

You can also get the complete 154 page Retrospect Express Users Manual. See Dantz FAQ for the link.

 

http://www.dantz.com/en/support/common_questions.dtml

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