Hello everybody,
I wonder what the best and easy strategy for backing up a hierarchy of folders and files that will be administer by an user. In my company, data are changing from Monday to Friday. The unique tool available is ntbackup.
Thanks in advance
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Incremental backups are always based on the previous backup, which has been incremental or full.
Differential backups are based on the last full backup only.
If you do a full backup on Mo, and daily differentials, the backup amount will increase each day (if different files are changed each day) or be constant (if the changed files are the same each day). But if you want to restore, you only need one full and one differential backup, and deleted files remain deleted if deleted after the first differential backup.
If you do a full backup on Mo, and daily incrementals, only the changed amount of data of each day is backed up. That is always less then with differential backups. But you need to apply one full and several incremental backups on restore, and file deletion is not honoured (they are part of either full or incremental backup).
So there is no "this is best" answer, it depends on too many factors and personal preferences which strategy you use.
In any case, once a week you should perform a full backup.
You should retain at least the last 4 weekly full backups.
You should retain one weekly backup of each month for at least 6 months.
You should retain one full backup each year.
This reduces the amount of data you need to have stored, but allows for restoring even after discovering you lost a file (e.g. accidentally deleted or overwritten) 4 months ago.
Thanks QIemo :)
I agree with your comments completely. VMWARE: You can read more on that in ntbackup help, but also, check on Google for more on backup rotation strategies, there are many possible combinations. This keeps your data "recoverable" for a long time. Main issue is always the user error (accidental deletion generally) and that can take time to discover so it's a very good idea to implement some type of rotation strategy to your backup.
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by: lucius_thePosted on 2009-10-22 at 12:18:37ID: 25637912
Depends on the size and avaliable storage od both data backup. You can make full backup each day, or make a full backup just on mondays and on other days use incremental or differential backups. You need to determine this by looking at the source data (how often does it change, how much is there) and avaliable backup storage space and speed. If you have a lot of data to backup that doesn't change much during days, then do incremental or differential backups.
You can easily schedule ntbackup jobs to do this automatically.