[Nssbackup-team] [Bug 294019] Re: (whishlist) Purging to free certain space

2011-01-03 Thread Jean-Peer Lorenz
This option is included in version 0.10.5
I don't think that the general option to purge (as currently included in 
sbackup) meets the described feature request. Therefore, I reopen this bug. 
Remarks and patches are welcome.

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Title:
  Purge to specified free disk space or backup size

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[Nssbackup-team] [Bug 294019] Re: (whishlist) Purging to free certain space

2011-01-03 Thread Jean-Peer Lorenz
Basically, I like the idea though I see following issues:

* how to delete snapshots (what order, latest first, newest first...)?
* how to cope these cases where defined requierements (e.g. keep 5GB free) 
cannot be met
* it's not possible to retrieve free disk space on some targets (ftp)

** Description changed:

- Since keeping enough free backup media space is the main purpose of
- backup purging and maximum single backup size can usually be estimated
- by the user (or even automatically as a total size all the files to be
- backed) it would be nice to have an option to purge backups until
- specified free space or total size of all the files to be backed is
- achieved.
+ Main purpose of backup purging is to keep enough free backup media
+ space. The actual backup size can be estimated by the user (or even
+ determined automatically as a total size all the files to be backed).
+ 
+ Please add an option to purge backups until a specified free space or total 
size of existing backup archives is achieved.
+ Example:
+ * Purge - keep 5GB disk space free
+ * Purge - max. size of backups (cumulated) 50GB

** Summary changed:

- (whishlist) Purging to free certain space
+ Purge to specified free disk space or backup size

** Changed in: sbackup
   Status: Fix Committed = Opinion

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Title:
  Purge to specified free disk space or backup size

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Re: [Nssbackup-team] [Bug 294019] Re: (whishlist) Purging to free certain space

2011-01-03 Thread Anton
On 03/01/11 15:18, Jean-Peer Lorenz wrote:
 This option is included in version 0.10.5
 I don't think that the general option to purge (as currently included in 
 sbackup) meets the described feature request. Therefore, I reopen this bug. 
 Remarks and patches are welcome.

Ideally, to free up necessary diskspace in combination with logarithmic 
purge, it would be good if the purge could be incrementally 'thinned'.
The default is:
* keep all from yesterday
* keep one per day from last week
* keep one per week from last month
* keep one per month from last year
* keep one per quarter from 2nd last year
* keep one per year further into past

(Especially the last one, while growing slowly, will keep growing
forever!)

But, when tight on diskspace, one could 'thin' this to something like:
* keep last one from yesterday
* keep one per two days from last week
* keep one per two weeks from last two months
* keep one per two months from last year
* keep one per half year from 2nd last year
* keep one per 2^n years for the nth year into past (true logarithmic!)

Alternate to steering on free space, one might want to set a limit on 
total diskspace allocated to backups. This might even work when disk 
free cannot be determined (as with ftp).


Anton.

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Title:
  Purge to specified free disk space or backup size

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