On 19/12/2020 13:36, Martin Gregorie wrote:
> On Sat, 19 Dec 2020 04:47:46 +0000, The Natural Philosopher wrote:
>
>> All my irreplaceable data is rsynced overnight. Handy when I
>> accidentally delete something - last night's backup is still there.
>
> Try rsnapshot: its fast (uses rsync to make backups) and lets you have
> more than just the last backup version available.

To be honest, in the last 10 years while the system has been running, I
have blessed it because two disks died in that time, but I have never
cursed it because I needed some audit trail of changes. If I were
writing software Id use sccs/rcs or equivalent anyway


  I have it set to make
> daily and keep 4 weekly backups, which means it keeps 7 daily backups,
> combining the dailys every week to make a new backup, which is kept for a
> month. as each 'backup' is simply a list of pointers to timestamped file
> copies, the rsnapshot backup set seems to be about twice the size of a
> single rsync backup and making the weekly snapshot takes twice as long to
> make as the daily one, i.e. 8 minutes compared with 4 minutes for the
> daily run and the complete set is 183GB.
>
Too effin complex for me

> For comparison, when I previously used compressed gzip daily backups,
> these took 3.5 hours and I could only fit 4 daily backups on a 320 GB
> disk.
>
When I set up this server back in the noughties, I looked at all the
ways of backing up data, and concluded that a sodding big disk was way
better than tapes or CDs or DVDS  and so that is what I bought.

It is simply a time delayed mirror. Because I am lazy it backs up
EVERYTHING. Trying to work out what it didnt need to was more cost to me
than the extra 100Mbytes of disk..

As the system data size grows disks get replaced with bigger ones. And
enormous rsyncs restart the whole thing...

*shrug* its good enough for SOHO. I am not managing terabytes of other
peoples data these days...

>
>


--
"First, find out who are the people you can not criticise. They are your
oppressors."
      - George Orwell

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