Hi,
as far as I understood it is the full backup that compares the files on the
backuppc server and the client machine. Checksums will be calculated on both
sides and compared.
http://backuppc.sourceforge.net/faq/BackupPC.html#Rsync-checksum-caching
Met vriendelijke groet,
Micha Kersloot
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> From: "Jan Stransky" <jan.stransky.c...@gmail.com>
> To: "General list for user discussion, questions and support"
> <backuppc-users@lists.sourceforge.net>
> Sent: Monday, 2 January, 2017 14:06:22
> Subject: Re: [BackupPC-users] Data integrity checks
> Hi,
> I have asked, because I have learnt about a tool, which calculates and store
> checksums of individual files as extended attributes. The basic idea was to
> check after a data transfer easily. I could imagine that similar concept could
> help track nasty things happening on both backuppc side and client side. Like
> checking sums of files which shouldn't change etc. The point is, when one
> instance of hardlink is corrupted, all others are too.
> I believe, that ZFS can help with that, ZFS is not always possible. Something
> like mentioned above would make it less dependet on filesystem.
> Jan
> On 01/02/2017 01:47 PM, Andreas Piening wrote:
>> Hi Jan,
>> the file based deduplication is based on checksums, so if a new file is
>> stored
>> with the same name and file-size it will only be stored as a new file if the
>> checksum is different. If the checksum is different, a hard link will be used
>> to point at the already existing copy.
>> But these checksums are used for deduplication only and as far as I know
>> there
>> is no additional integrity check, for example on a restore.
>> Honestly I don’t think it is really needed. I’m using a ZFS volume for
>> backuppc
>> which has build in block level checksums for integrity.
>> Probably this is an option for you?
>> Kind regards
>> Andreas
>>> Am 02.01.2017 um 12:29 schrieb Jan Stransky < jan.stransky.c...@gmail.com >:
>>> Hi,
>>> does backuppc do some data integrity checks on stored files or files
>>> to-be-stored? Something like regular md5sum checks.
>>> Jan
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