I don't think unmount/remount would change the modification time.
However, it might change the mountpoint. Windows uses a multiple-root
filesystem. Each drive letter is actually a root path. A remount or
reboot could very well result in a USB drive previously mounted as E: to
be remounted as D:. When that happens, Bacula will see all of the files
as being at a different path than the previous backup, so an incremental
will be forced to backup the whole drive. Of course it will. If you
unmount/remount a filesystem on Linux to a different path, Bacula will
do the same thing.
If that is the issue, then it is also possible to mount the USB drive to
an empty folder on a NTFS filesystem, rather than a drive letter. This
can be done in Computer Management/Disk Management using Select Action >
All Tasks > Change Drive Letter and Paths. The USB drive partition does
not have to be NTFS, but the folder it is being mounted to does.
On 10/14/24 09:07, Marco Gaiarin wrote:
Backup of external media need some specific setup?
I've changed the subject because was totally misleading; but still i need
some clue...
I need to backup an external, USB, disk mounted on a Win10 client; disk
contain 8TB of data, scattered in many files/dirs. I'm using progressive
virtual full, so i'm using 'accurate = yes'.
I've tried with default fileset options, then with 'accurate = sm' but for
both, sooner or later (i supposed when the client get rebooted; or usb bus
reset and disk get umounted/remounted) i get an incremental backup of the
size of a full (8TB), so simply *ALL* files are considered modified by
bacula.
I've tried 'accurate = s5' and incremenetals seems behave right, but an
incremental took more or less a day to complete. Too slow...
I coud try 'accurate = s' but i think is is unacceptable... too risky...
There's some 'knob' to play with? Windows side (eg, prevent to alter/fake
modification time on remount) or bacula side?
Thanks.
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