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====More commom scenarios & explanation of backup selection settings====
====More common scenarios & explanation of backup selection settings====
Here are some typical scenarios, keep in mind the choice of full backup on a specified day or every day will also interact with these settings.
Here are some typical scenarios, keep in mind the choice of full backup on a specified day or every day will also interact with these settings.
If you wanted to do a full backup every day, & only retain 1 historical backup, then select
If you wanted to do a full backup every day, & only retain 1 historical backup, then select
Number of daily backups contained in each set is 1.
Number of daily backups contained in each set is 1.
Number of rotating backup sets is 1.
Number of rotating backup sets is 1.
If you wanted to do a full backup once every 7 days, then daily incremental backups every other day, & only retain 1 historical backup, select
If you wanted to do a full backup once every 7 days, then daily incremental backups every other day, & only retain 1 historical backup, select
Number of daily backups contained in each set is 7.
Number of daily backups contained in each set is 7.
Number of rotating backup sets is 1.
Number of rotating backup sets is 1.
If you wanted to do a full backup once every 14 days, then daily incremental backups every other day, & only retain 1 historical backup, select
If you wanted to do a full backup once every 14 days, then daily incremental backups every other day, & only retain 1 historical backup, select
Number of daily backups contained in each set is 14.
Number of daily backups contained in each set is 14.
Number of rotating backup sets is 1.
Number of rotating backup sets is 1.
If you wanted to do a full backup once every 28 days, then daily incremental backups every other day, & only retain 1 historical backup, select
If you wanted to do a full backup once every 28 days, then daily incremental backups every other day, & only retain 1 historical backup, select
Number of daily backups contained in each set is 28.
Number of daily backups contained in each set is 28.
Number of rotating backup sets is 1.
Number of rotating backup sets is 1.
For any of the above, if you want to retain more historical backup sets, then change the
For any of the above, if you want to retain more historical backup sets, then change the
Number of rotating backup sets to 2 or 3 or 4 as desired
Number of rotating backup sets to 2 or 3 or 4 as desired
So let's say the full backup is set to run on Friday only, & the backup time is set for 11pm.
So let's say the full backup is set to run on Friday only, & the backup time is set for 11pm.
On the first Friday night at 11pm a full backup is done, this may take many hours or even time out if there is a lot of data to backup.
On the first Friday night at 11pm a full backup is done, this may take many hours or even time out if there is a lot of data to backup.
On the first Saturday night at 11pm if the full backup did not complete the night before (timed out as per time out setting or reached 24 hours run time), then the full backup is continued on from where it left off.
On the first Saturday night at 11pm if the full backup did not complete the night before (timed out as per time out setting or reached 24 hours run time), then the full backup is continued on from where it left off.
If the full backup did complete, then an incremental backup is done, so only the additions & changes of data are added to the first full backup.
If the full backup did complete, then an incremental backup is done, so only the additions & changes of data are added to the first full backup.
These are added as incremental backups, in a seperate incremental backup file with a date identifier.
These are added as incremental backups, in a seperate incremental backup file with a date identifier.
Then on the Friday (being either day 8, 15 or 29 in examples above) at 11pm a new full backup is done.
Then on the Friday (being either day 8, 15 or 29 in examples above) at 11pm a new full backup is done.
After that incremental backups are done each day, & so the cycle continues on.
After that incremental backups are done each day, & so the cycle continues on.
Note, when a full backup is done:
Note, when a full backup is done:
If Number of rotating backup sets is set to 1, then the original (first) backup is deleted.
If Number of rotating backup sets is set to 1, then the original (first) backup is deleted.
If Number of rotating backup sets is set to 2, then the original (first) backup set is retained & a new backup set is created/started.
If Number of rotating backup sets is set to 2, then the original (first) backup set is retained & a new backup set is created/started.
If Number of rotating backup sets is set to 3, then the first & second backup sets are retained & a new backup set is created/started.
If Number of rotating backup sets is set to 3, then the first & second backup sets are retained & a new backup set is created/started.
If Number of rotating backup sets is set to 4, then the first, second & third backup sets are retained & a new backup set is created/started.
If Number of rotating backup sets is set to 4, then the first, second & third backup sets are retained & a new backup set is created/started.
.... & so on.
.... & so on.
A "practical" backup approach may be to configure for a Full backup every 7 days & daily incremental backups in between, with 2 rotating sets, so a new full backup is created each Friday & you retain a complete 7 days worth of backups for historical purposes.
A "practical" backup approach may be to configure for a Full backup every 7 days & daily incremental backups in between, with 2 rotating sets, so a new full backup is created each Friday & you retain a complete 7 days worth of backups for historical purposes.
You could even extend that to retaining 4 sets of historical backups, in case you wanted to restore some individual files from 25 days ago.
You could even extend that to retaining 4 sets of historical backups, in case you wanted to restore some individual files from 25 days ago.
