During the SAP HANA DB File Naming convention as below, there is no specification about the LENGTH OF THE BACKUP FILE NAME as in the help.sap.com to find.
PREFIX - CDB ( Complete data backup)
$DATETIME ( DATE TIME)
$SUFFIX ( Default value as it come _databackup_ *)
SAP HANA DB 1.0
SAP HANA DB 2.0
FAQ, Character, String , KBA , HAN-DB-BAC , SAP HANA Backup & Recovery , How To
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