Re: decremental backup

On 23/08/2021 11:38, griffin tucker wrote:
> sorry, i just found the man entry saying that the decremental backup
> is not compatible with delta binary - i'll have to settle for
> incremental delta sig

OK, I will see how to add a warning message to avoid others to waste
their time in that context.

> 
> On Mon, 23 Aug 2021 at 08:47, griffin tucker
> <darsuporpt340-DSTKDfZ7/[email protected]> wrote:
>>
>> i've got two existing full backups and the command i'm using in my
>> script is to make the decremental is:
>> dar -+ "../${prev}-decr" --delta sig --ref="../${prev}-full"
>> --aux="../${current}-full" --hash=sha512 --slice=2G
>> --overwriting-policy Pp --alter=decremental --alter=keep-compressed
>>
>> however interactively i'm asked:
>>
>> EA and FSA of file <ROOT>/siteinfo-namespaces.json.gz-sha1sum.txt are
>> about to be dropped from the archive and marked as already saved,
>> proceed? [return = YES | Esc = NO]
>>
>> repeatedly for every file
>>
>>
>> i can add the -w switch so it stops asking interactively, however this
>> results in the resulting archive being roughly the same size as the
>> aux archive
>>
>> i know the differental backups work incrementally with much smaller
>> resulting archives, however i want to do decremental - what am i doing
>> wrong? i've tried various different overwriting policies with no
>> impact on the result
>>
>>
>> just fyi, dar -V is:
>>
>>  dar version 2.7.1, Copyright (C) 2002-2021 Denis Corbin
>>    Long options support         : YES
>>
>>  Using libdar 6.4.0 built with compilation time options:
>>    gzip compression (libz)      : YES
>>    bzip2 compression (libbzip2) : YES
>>    lzo compression (liblzo2)    : YES
>>    xz compression (liblzma)     : YES
>>    zstd compression (libzstd)   : YES
>>    lz4 compression (liblz4)     : YES
>>    Strong encryption (libgcrypt): YES
>>    Public key ciphers (gpgme)   : YES
>>    Extended Attributes support  : YES
>>    Large files support (> 2GB)  : YES
>>    ext2fs NODUMP flag support   : YES
>>    Integer size used            : 64 bits
>>    Thread safe support          : YES
>>    Furtive read mode support    : YES
>>    Linux ext2/3/4 FSA support   : YES
>>    Mac OS X HFS+ FSA support    : NO
>>    Linux statx() support        : YES
>>    Detected system/CPU endian   : little
>>    Posix fadvise support        : YES
>>    Large dir. speed optimi.     : YES
>>    Timestamp read accuracy      : 1 nanosecond
>>    Timestamp write accuracy     : 1 nanosecond
>>    Restores dates of symlinks   : YES
>>    Multiple threads (libthreads): YES (1.3.2)
>>    Delta compression (librsync) : YES
>>    Remote repository (libcurl)  : YES
>>    argon2 hashing (libargon2)   : YES
>>
>>  compiled the Aug 17 2021 with GNUC version 10.2.1 20210110
>>  dar is part of the Disk ARchive suite (Release 2.7.1)
>>  dar comes with ABSOLUTELY NO WARRANTY; for details
>>  type `dar -W'. This is free software, and you are welcome
>>  to redistribute it under certain conditions; type `dar -L | more'
>>  for details.
> 
>