On Thu, Aug 31, 2017 at 10:45 AM, Gandalf Corvotempesta <
gandalf.corvotempe...@gmail.com> wrote:
>
> Ok but let's simulate a crash in your example:
>
> On day 2, before the incremental backup, the filled one (day0) is lost.
> Is backup made on day1 still available with "all" files or only with
> the latest 5GB added between day0 and day1 ?
If you went to disk, and manually deleted backup "0" , backup 1 would still
exist, with references to all the new files, but I cannot predict how
BackupPC would react to the missing 'filled' full backup, nor am I willing
to test that for you. You would be in a really unusual, unexpected state,
which is why BackupPC documentation suggests that you have regular 'filled'
available.
Finally, don't confuse a 'filled' backup with a 'full' backup. A full
backup is 'filled' by default, but an incremental backup can be filled (
every 7 days using default settings) to help BackupPC keep track of things
better without any additional data transfer or checksum time. A 'full'
backup is used to prevent bit rot. Pick a timeframe that makes sense in
your environment. Quarterly works for us, but I considered every 6 months.
I would suggest that you try it out, and before you depend on it, try
breaking BackupPC in all the ways you're worried about and see how it
behaves. A lot of what you're asking us results in speculative answers
because we haven't tried deliberately breaking our backups in the ways you
suggest.
--
Time flies like an arrow, but fruit flies like a banana.
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