Re: Re: [OT] Backups

[Chris Hunter <cjhunter@xxxxxxxxxxxx>]

Interesting, thanks ... tricky for a domestic situation ...

a DVD approach seems attractive, but we have noticed signs of a
significant number of failures with our movie DVDs, even after a few
plays ... which the DVD player does make a reasonable job of
recovering -  of course, with data, that wouldn't work so well ...

can't help think of Paul & all his movies etc ...

Chris


On 2 Jun 2007, at 12:37, Paul Bendall wrote:

> Chris,
>
> Backup tapes are the same be that DAT, DLT, LTO all are supposed to be
> recalled, data restored, tape thrown, new tape used for backing up the
> data again. The cycle for this is recommended at 3 years. Another
> reason to use hard-disks, in an array with hot-spares you just replace
> disks as and when they fail. But I am still talking about a backup
> based HDD array rather than production which may also be RAID.
>
> Most companies now use SAN or NAS technology with a Snap technology
> for
> day to day backups. These capture just the disk deltas (changes)
> compared with the last Snap at a block level. The Snap is both fast to
> take and restore and the size of each Snap is relatively small.
> Monthly
> backups are then taken to allow for historic restores or
> investigations. The data retention period is commonly 7 years and each
> company has a different take on what they do and publish.
>
> Paul
>
> --- In ukha_d@xxxxxxx, Chris Hunter <cjhunter@...> wrote:
>>
>> If tapes, be careful to look after them & be prepared to copy
them
> at
>> intervals ... 'say this as one who thought tapes lasted for ever,
if
>> treated carefully, but (at least with my reel-reel hi-fi tapes)
this
>> is not reliably the case ... they can absorb moisture & go
very
>> slightly sticky ... careful baking can restore most ... have some
>> links, if interested ... I imagine hi-fi & data tapes are
>> similar ... ???
>>
>> Chris
>>
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