Re: Incremental and permission changes

A change of permissions is necessarily going to be a true change to the 
file's attributes at the filesystem level. As such, the filesystem is 
going to update the change time (st_ctime) for the file,

When not using Accurate mode, Bacula selects files for backup that have 
a change in st_ctime or st_mtime since the last backup.

When using Accurate mode, the accurate attribute can be set in the 
FileSet with a number of options on how to select the files, including 
ctime, mtime, change of permissions, change of signature, change of 
size, etc. You will need to use accurate mode and be sure not to select 
files based on st_ctime changes.


On 2/5/26 03:16, Andrea Venturoli wrote:
> On 2/2/26 10:13, Andrea Venturoli wrote:
>> Hello.
>>
>> In an installation I manage, there's a NAS with lot of data that is 
>> backed up with the usual Full/Diff/Inc schedule.
>> On this NAS it's quite frequent to have sweeping permission changes; 
>> alas these almost translate an Incremental backup into a Full one.
>>
>> I don't care about permissions: I can set them up automatically after 
>> a restore, so I'd like to avoid this.
>>
>> What's the proper way to tell Bacula NOT to backup a file if only its 
>> permission changed?
>> Or, again, don't backup permissions at all, if the above is not 
>> feasible?
>>
>> I also thought about using "accurate: mco1", which should backup the 
>> permissions, but not the files themself. This could do...
>> Before putting it into production, though, are there any caveat?
>>
>> Any other idea?
>
> No one?
>
>  bye & Thanks
>     av.
>
>
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