The Backup branch under Configuration - File Handling has the following options:
Backup Files on Save
When a file is saved the option to generate a backup file is provided. Three choices are available:
No backup - When a file is saved the original file is overwritten and a backup file is not created.
Replace extension with .BAK - When the file is saved, the original file is copied or renamed to a backup file with the same filename and a ".BAK" extension in place of the existing extension. The modifications are saved to the original filename/extension.
Append .BAK to the existing extension - When the file is saved the original file is copied or renamed to a backup file with the same filename and extension and ".BAK" is added to the filename (filename.ext.BAK). The modifications are saved to the original filename/extension.
Default backup directory
Normally the directory used for the backup file is the same directory as the source file. This parameter allows all backup files to be copied to the same backup directory. If this item is left blank the directory used will be that of the source file.
Version backup
The options here allow users to specify settings for sequentially numbered backups of active files.
On save
If this option is selected a backup file with a version number will be saved every time a save of an active file is executed.
On automatic save
If this option is selected a backup file with a version number will be saved every time an automatic save of an active file is executed.
On FTP save
If this option is selected a backup file with a version number will be saved every time an FTP file is modified and saved. Note: If a Local Backup Directory is already specified under the Advanced tab for an FTP account, that directory will override the Default FTP backup directory option for files opened from that server.
Default FTP backup directory
In order to select the On FTP save item above, a local directory must be specified here. When a file is backed up, the account name will be created as a root folder below the directory specified and directories will be created as necessary to recreate the location of the modified file on the remote server.
Format
This text field may be used to specify the format to be used for version backups. The following items may be defined:
Path Variables:
$b - Default Backup Directory
$p - File Path
$n - File Name
$e - File Extension
Time/Date Variables:
$H - Hour
$M - Minute
$d - Day
$m - Month
$y - Year
Miscellaneous:
$c - Counter
$u - User Name
$s - Session
Maximum number of backups
This field may be used to specify the maximum number of version backups to be saved for each file. A value of "-1" would indicate an infinite number of version backups.