Of course, the backup process will take a bit longer. Note: The definition of a “large pst-file” is somewhat relative and on most systems having a pst-file of 4GB or even 10GB is no problem at all. To split it into yearly archives (or any other amount such as quarterly, or every 2 years), you can run the Archive process multiple times, each time to a new pst-file. Splitting a pst-file can be done via the Archive feature in Outlook.
Is there any way I could split up my pst-file into yearly archives? As data will no longer change in these pst-files, I would no longer have to include them in my daily backups. To speed up Outlook and backup performance, I thought about splitting up my pst-file into multiple files. For years I’ve been using the same pst-file with Outlook and it now has grown quite big (it currently is 5.6GB).