On 2021-05-26 07:01, Jens Potthast wrote:
Hi,
My Problem: When doing an incremental backup with smb, only files with
mtime
newer than the date and time of the last backup are being backed up.
To reproduce: If I copy a file with an old ctime, the file is not
included
in the backup even if it is not contained in the previous complete
backup.
Only the timestamp of the mtime seems to be relevant - even if the file
is
not present in any backup so far.
I am not sure, if this behavior is intended or if I have misconfigured
smb
backup settings.
The problem would be solved with the next complete backup. However, due
to
my circumstances, I can rarely do a full backup. And only with rsyncd,
because smbclient aborts after a while, because I have to backup lots
of
files (> 1.000.000), which takes usually more than a day. (However, not
due
to configurable time limits, which I extended generously.)
An incremental backup with rsyncd unfortunately takes almost as long as
the
full backup, so I need to do the incremental backups with smbclient.
This
takes only minutes (with only a few changed files), but misses new
files
with an old date.
Any help is greatly appreciated!
Regards,
Jens
You're describing a limitation of using SMB. Considering it for a
moment, one can ask SMB to retrieve files modified beyond a certain
time, but SMB does not have a command that says, "send along any files
that weren't there at a certain point in the past." How would SMB know
the files weren't there?
How would one implement such a command using SMB? By retrieving all
files, and comparing to a previous backup... which is also known as a
full backup.
It is worth poking at the contention that "an incremental backup with
rsyncd unfortunately takes as long as the full backup." This probably
isn't true, but I can understand how one can believe this after running
a single incremental backup with rsyncd. How does rsyncd know what to
copy incrementally? It skips files that are already copied ... of
which, there are none for your first incremental backup.
If your *second* incremental backup takes almost as long as the full
backup, we'll need more details, as your configuration is deviating
significantly from expectations._______________________________________________
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