[Coco] OS-9 Incremental Backups and how they might be done.

Sun Apr 5 16:39:36 EDT 2015

None of those sound like something to look at. 

The basic problem which can be done several ways is to have a map of what files have been backed and then check what has changed and only back up the changed or new files. 

I use http://www.2brightsparks.com/syncback/sbse.html and have two versions running side by side, one on Nani (Normal User) and one on Nani-Trinity (Administrator) 

The both run automatically, one at 6 PM and one at 6:30 PM. Different time on my HTPC for backing up my automatically downloaded programs listings and then programs I have seen.

Great right now as "decades" has a gun to my HTPC (Peter Gunn). 114 episodes in total,  about three more days or so to go.

Then there was the very fast software that came with a HD and another set with a different HD.

None of these methods and many others I have seen require any bits in the file or the funny sector before the file.

You just need to think about the problem at a higher level.

Your approach will  not work for the general user. Helping others is your goal or is it just flipping the bird.

SHF

From: "Gene Heskett" <gheskett at wdtv.com>
To: <coco at maltedmedia.com>
Sent: Sunday, April 05, 2015 1:01 PM
Subject: Re: [Coco] OS-9 Incremental Backups and how they might be done.

> On Sunday 05 April 2015 14:48:29 Stephen H. Fischer wrote:
>> This whole discussion about incremental backups IMHO is at the wrong
>> level.
>>
>> It appears that Gene wants to set a bit in a file when the file has
>> been backed up and need not be backed up again.
>>
>> Yes that is the way that MSDOS, Windows and perhaps Apple and Linux do
>> it but it is unclear if we can free up the single bit.
>>
>> -----------------------------------------------
>> There have been several backup programs offered for OS-9 over the
>> years.
>>
>> They need to be looked at, perhaps the task has already been done or
>> we can build on reducing the effort.
>>
>> Spending our time looking for a solution that has already been done
>> has more worth than looking for a bit that may never be found.
>>
>> Start looking here  ftp://www.rtsi.com/OS9/OS9_6X09/
> 
> And the only backup which used that bit was Back_AR, also from my commit 
> I believe. Theres a possibility its the original, and I fixed it but 
> never committed to RTSI.
> 
> But I didn't write the original, just debugged it and made it work, until 
> the big blowup when Boisy got bit. I had already been bit at that point, 
> and made some noise before Boisy got bit that EVERYONE should up the 
> SAS= in their rbf descriptors to avoid that.
> 
> But as usual, my voice was ignored.  By Boisy it turned out.  Sigh.
> 
> The only other "cross media format" backup on that site is BRU_1_2, which 
> does not honor any means of an incremental mode.  I should know, that 
> build came from my machine, a long long time ago. 2 decades maybe.  No, 
> almost 23 years. Unforch, its data handling in a byte by byte format 
> makes it set stakes and call a surveyor slow when backing up, and a 
> recovery is about 8x slower yet.  I did one, to 720k floppies, took 3 
> days , and the test recovery was nearly 3 weeks.
> 
> I always intended to make it do it a sector at a time which should have 
> been at least 20x faster, but like you, lost my round tuit.  The source 
> is there, so anyone that wants to try, make like a frog and jump right 
> in.  And while you are doing that, find us an unused bit in the 
> fd.sector that we can use without any fireworks like the Back_AR bit did 
> to at least 2 of us.  FWIW, the exact same speedup comment could be 
> applied to rzsz, but its a utility that can overrun the coco's ability 
> to process data when its receiving is about done, we have far better 
> ways to move data now with dw.
> 
> From the directory where I keep that, an image of the Maxtor 7120s I ran 
> for 15+ years until stiction made me start beating on a corner of it to 
> get it started:
> 
>   0  1992/03/20 02:35  ----r-wr    A6DC      46B2 bru1.0_bin.ar
>   0  1992/03/20 02:35  ----r-wr    A6E0      7BCC bru1.0_src.ar
>   0  1992/10/04 01:45  ----r-wr    A6E4      503A bru1.1_bin.ar
>   0  1992/10/04 01:34  ----r-wr    A6E8      85CF bru1.1_src.ar
>   0  1992/12/13 23:38  ----r-wr    A6EC      6E4B bru1.2_bin.ar
>   0  1992/12/13 23:38  ----r-wr    A6F0      9E80 bru1.2_src.ar
> 
> Back_AR.ar is almost as old:
>   0  1993/09/22 20:26  ----r-wr    7800      4F3F BackAr_3.ar
> 
> RTSI's occassional recreation of that repo from backups does us zero 
> favors in determining whats new, and whats old enough to have voted 
> several times.  I should NOT have to resort to my own storage media to 
> date this stuff.  But thats life...
> 
> [...]
> 
> Cheers, Gene Heskett
> -- 
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page <http://geneslinuxbox.net:6309/gene>
> 
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