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Incremental Backup copies unchanged files

I have Nero Platinum 2015 and use Nero BackItUp to perform incremental backups. I have just observed that subsequent back ups after the initial one are backing up files that have not been touched since the initial backup. Any ideas on why Nero is backing up these files that have not been modified? It is making the backups very large and time consuming to run. Note that Nero is not backing up all such files, it appears random as to which ones it is choosing. Thanks.
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  • Hi Brad-

    Are you backing up only personal files or are you backing up files which might be related to the operating system (not operating system files since Backitup 2015 doesn't back up the operating system). For instance, are you backing up files in C:\users?
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  • Thanks for the reply.

    I am backing up only personal files - nothing related to the OS. Off my PC, a NAS and another PC. As an example, the latest incremental backed up 2 songs from a music album sitting on the NAS, which had not been touched, played etc since the last backup only 12 hours before. Another example, it backed up a whole swag of pictures on my PC Pictures library which had not been touched for ages.

    I had done an incremental that finished about midnight, and then I did another incremental at 2:30pm the next day. This latest backup copied 3366 files - and I was the only one working on the system during that period. I maybe caused 20 files max to be changed/added.

    Thanks.
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  • Yes. How would this impact which files are chosen?
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  • Normally, when you run a backup manually, the backup is a full backup each time. If you schedule the backup to run automatically, say daily, it will be a true incremental backup. The first backup is always a full backup and then the next backup will be a backup of the files that have changed since the last backup. The disadvantage of an incremental backup is that it takes a lot of space. An update type backup takes less space but Backitup 2015 doesn't have that option and an update backup doesn't give you an option to restore files that have changed between the backups.

    My recommendation is to set up a daily backup and let it run on its own. If you see the same type of behavior, let me know.
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  • Thanks for your response.

    I have selected Incremental Backup, and then I select to run it manually. The backups after the first backup are definitely not full backups. For example, the initial backup is 455GB in size whilst the last was 10MB. So that makes sense to me. What doesn't make sense is why the backups after the initial includes files that have not been modified in any way. As an example, the latest backup included 2 songs out of a folder containing 16 songs. The initial backup included all 16 songs. The folder has not been opened since that initial backup, nor the metadata on the files changed, nor have they even been played. And this is just one example of many.

    Automated backups don't work for us as we can work on the files at any time, so need to change the time at which the backup is run.

    Thanks.
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  • In your case, you're worried about being able to restore files every time they're changed. In that situation, you should select Continuous for the backup. However, that will result in using space on the target at a very fast rate.

    Older versions of Backitup (v12 and earlier) had something like livebackup which was an incremental backup and you could set the frequency more finely than you can with Backitup 2015.

    I think the problem with using a NAS is that it may switch to a different drive during use and Backitup may be interpreting that as a change.

    I recommend that you send an e-mail to techsupport@nero.com. Please let me know what they have to say.
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