We did this test for LONGBLOB and LONGTEXT fields. Source code is provided in this post, which uses files available in fwh\samples folder and can be tested by any.
[code=fw:117taoqo][/code:117taoqo]
First we created a table "wwonders" wit fields ID (AI), NAME( VarChar ), IMAGE ( LONGBLOB ) and DETAILS( LONGTEXT ) with 4110 records.
Total Size of LONGBLOB field contents : 0.493 GB
Total Size of LONGTEXT field contents : 0.043 GB
Total size 0.540 GB
Backup file size 1.070 GB created in 20 seconds.
Restored in 2 minutes and 10 seconds.
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