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Microsoft Outlook is fairly a famous and heavily used email client.
Its actually a productivity suite as it includes a host of other tools in addition to email management.
Each file format has its advantages and disadvantages.

The locations and other information may differ slightly for older versions like Outlook 2013, Outlook 2010, etc.
PST file stores information like emails, folders, calendar, contacts, tasks, notes, etc.
The data in the PST file can be encrypted and compressed.

A user can create multiple PST files in Outlook and move items including emails, contact, etc.
between two or more PST files.
After that, Outlook will not give you an error or warning.

It will just stop accepting new items.
So you will need to archive some items from the PST file to keep it under 50GB.
The performance of the PST database slows as the size of the file grows.

So its recommended to keep your PST files as low as possible, possibly under 20GB.
The archive is another PST database file which resides on the local computer.
OST database has a file size limit of 50GB and all other characteristics are the same as PST file.

Although the most important data like emails, contact, etc.
then you will need to back up its specific file.
Here is the list of files related to Outlook.

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source: www.itechtics.com