differential and full backup schedule

can anyone give their thoughts on the below. we are doing some risk assessment work on backups (backed up to tape via backup exec v12.5). looking at the schedule, there is a differential backup Monday, Tuesday, Wednesday and THursday of every week at 11pm. There is no backup job at all from what I can see on Fridays, and then on saturday a full backup takes place at 8pm (and seems to take up to 2 days!)....

is there any logic why you wouldnt do any backup at all on friday? I am not from a backup background so any input or views most welcome.....
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pma111Asked:
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rindiCommented:
In my point of view not really. Normally the full backup should be scheduled on Friday, particularly if it takes so long.

Sometimes though there may be other automatic maintenance tasks scheduled on a server, like Virus scans etc, and those can sometimes interfere with backups. so that may be a reason for the full backup being scheduled for later.
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Sajid Shaik MSr. System AdminCommented:
it seems that the backup job is configured to take differential backup on those days assuming Friday is the Holiday then the Saturday is the first working day hope fully..

to make it sure .. open backup exec - click backup and restore - double click the listed job- right click and edit the listed job -
in the windows right side backup i click edit button  - on top left schedules click and check the schedules.

in schedule u'll find the days for Differential backup check boxes has to be check..

in full backup u have to select the day which u want to take full backup..

any how allbe.jpg the best
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pma111Author Commented:
Friday is a working day, Sat/Sun are the holidays...
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pma111Author Commented:
rindi - is this design a risk then, as you basically have a large gap with no backup which could impact recovery point objectives? this acts as a file server so is bei updated regularly from monday-friday...
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pma111Author Commented:
I assume a full backup takes a lot longer than a differential backup?
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rindiCommented:
It depends. If something fails on Friday, you would loose the data from that day. On the other hand that probably isn't a lot of data, and most of it is probably still in the memory of the people who created the data, so it would be likely they could recreate most of it.

If there is a virus scan going on before the backup, the reason could be that you only want "Virus-Free" full backups (although you can never be 100% sure of that, as no virus scanner is perfect).

Differential backups only backup data that was changed since the last full backup, so naturally they take a much shorter time.
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Sajid Shaik MSr. System AdminCommented:
Mr. Rindi is right the backup strategy is purely depends upon the companies requirements... to understand better please see this article.

How to choose the correct backup type
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nobusCommented:
maybe the company has activities on fridays -inhibiting the backup ?
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Thomas RushCommented:
Experts who've provided answers above have covered many of the key points:
- Yes, not backing up on Friday night puts Friday's data at risk for three times as long as other business days' data (instead of one day, it's one day because no backup on Friday night, plus two more days until the full backup completes, total of three days of vulnerability before Friday's data is safely backed up)
- There may be some reason why a backup was not scheduled on Friday night; a virus scan or other maintenance are possible reasons.  It is important for you to understand if there was a reason, and if so, what it was.  Perhaps the reason is no longer valid, and all you have to do is move the full backup to Friday.
- Better yet (from a protection-of-data perspective), I would recommend you consider implementing a differential backup on Friday nights (assuming other business processes don't prevent it), and then kick off a full backup when the Friday Differential is complete.   This will minimize the time that Friday's data is unprotected.

In addition, I will ask which backup application you're using.  Several modern backup applications now have a backup option that sounds perfect for your situation called "Incremental forever with synthetic full backups" (or something similar).   The idea is that you backup to disk initially, completing one full backup.  Once that full is complete, you'll only do incremental backups from your production server -- minimizing backup I/O, and no more 48-hour backups!
The second key part of this is that you'll periodically create a "synthetic full backup", where you tell the backup application to create a full backup from the data on disk, just as if you'd done a full backup at that point in time.  That is, it goes through its pointers to all the backup files, and pulls from the backup-to-disk the files that would have been backed up had a full backup of the file system been done at that time.   This synthetic full is often created on physical tape so that you can take it to off-site storage.  Off-site storage of backups is very important to ensure that a site disaster won't destroy your systems and your backups!

An Incremental Forever strategy is a very powerful tool for a business that has a high percentage of data that doesn't change, or has servers with lots of tiny files that cause unacceptably long backup times.  If you can implement this  strategy, you'll see a number of benefits, including better recovery times, increased levels of protection, less load on your network, and more.    HP's Data Protector supports it; I believe that Backup Exec does now as well, and IBM's TSM certainly does (although I wouldn't recommend TSM for a SMB that isn't already using it); others might also.
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