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Old 5 Jul 2021, 09:25 PM   #3
JeremyNicoll
Essential Contributor
 
Join Date: Dec 2017
Location: Scotland
Posts: 483
A single file has a lot of disadvantages:

- if it suffers any corruption, you lose access to all your mail & settings. By comparison many applications keep each folder's mail etc separate so even if one folder is corrupted you can still access all of the others.

- even if most of your mail is old, and therefore only needs rare backups made, the whole file will have to be backed-up every time you make a backup, which might be very slow. If there are many folders only those that have changed will need regular backup. Since you should be doing that at least once per day, that will save a lot of time.

- if you sync that file to a cloud service it will likely have to upload the whole thing every time, because too many small changes wll have occurred inside it for the sync to be able to identify just the changes and sync those alone
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