On 13 Jan 2021 at 22:45:19 GMT, Richard Falken  wrote:

>   Re: Re: My darn NAS...
>   By: TimS to All on Thu Jan 14 2021 11:43 am
>
>  > Incremental backup as done by Time Machine allows many more backups. It's
do
>  > with hard links, so a file is backed up the first time, but hard links are
>  > created for subsequent backups. This means that what is presented to me
when
>  > want to do a restore from a selected date just looks an ordinary folder as
i
>  > would appear on the Desktop. I highlight one or more files/folders with
the
>  > mouse and click Restore. No farting about with command line options that I
>  > have no interest in remembering.
>
> Hard link based incremental backups are great. I do a lot of it with rsync.
> There is something worth mentioning, though:
>
> You may use hard link based backups in order to make a snapshot per week, but
> if a file remains unchanged for long, all your hard links will be pointing to
> the same file in your backup drive. This means if the file gets corrupted you
> have no copies of it despite having 500+ "images". I have seen it happen and
it
> is not pretty.

I don't know whether Time Machine does this or not, or perhaps limits the
number of hard links to any file and creates a new complete backup of teh file
and starts again.

On my main file machine I've set TM to use a second disk; it alternates
between them, so this is some protection.

--
Tim

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