Use the incrbydate option with the incremental command to back up new and changed files with a modification date later than the last incremental backup stored at the server, unless you exclude the file from backup.
An incremental-by-date updates the date and time of the last incremental at the server. If you perform an incremental-by-date on only part of a file system, the date of the last full incremental is not updated and the next incremental-by-date backs up these files again.
Important: The last incremental backup time refers to the
server time and the file modification time refers to the client time.
If the client and server time are not synchronized, or the client
and server are in different time zones, this affects incremental-by-date
backup with mode=incremental.
The last incremental backup time
refers to the server time and the file modification time refers to
the client time. If the client and server time are not synchronized,
or the client and server are in different time zones, this affects
incremental-by-date backup and image backup with mode=incremental.
Both full incremental
backups and incrementals-by-date backups backup new and changed files.
An incremental-by-date takes less time to process than a full incremental
and requires less memory. However, unlike a full incremental backup,
an incremental-by-date backup does not maintain current server storage
of all your workstation files for the following reasons:
- It does not
expire backup versions of files that are deleted from the workstation.
- It does not rebind backup versions to a new management class if the management class has changed.
- It does not back
up files with attributes that have changed, such as Access control
list (ACL) data, unless the modification dates and times have also
changed.
- It does not back up files with
attributes that have changed,
such as NTFS security information, unless the modification dates and
times have also changed.
- It ignores the copy group frequency attribute of management classes.
Tip: If
you have limited time during the week to perform backups, but extra
time on weekends, you can maintain current server storage of your
workstation files by performing an incremental backup with the incrbydate option
on weekdays and a full incremental backup on weekends. Supported Clients
This option is valid for all clients. The Tivoli Storage Manager client API does not support this option.
Parameters
There are no parameters for this option.
Examples
- Command line:
- dsmc incremental -incrbydate