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Fine tune the way SyncBack handles file change detection.
This tab is only displayed in Expert mode.
When a profile is run, SyncBack only copies files that have been changed. It uses four different methods to check if a file is different in the source and destination:
1. Last file modification date & time: All files record the date & time of when they were last changed.
2. File size: All files record the number of bytes they contain.
3. Hash value: A unique value can be computed based on the contents of a file. These values can be used to check if a files contents is the same as another's.
4. File attributes: Files have special attributes, e.g. read-only, hidden, etc., and SyncBack can optionally check for changes in these attributes
You have the option to not use some of these methods, and also change how they are used.
Ignore date & time changes of x seconds or less: In some situations, the file system itself may not accurately record the correct date & time when a file was last modified. This can occur when using SAMBA shares. With this option, you can tell SyncBack to ignore small differences in the date & times, e.g. ignore differences of 2 seconds or less. Note that the difference is rounded down to the nearest second, so a difference of 2.99 seconds is treated as 2 seconds. To avoid inaccuracies in file systems, and differences between file systems, SyncBack will ignore differences of 2 seconds by default. You can of course change this if you require finer accuracy.
Use slower but more reliable method of file change detection: By default, SyncBack will not compute the hash value of a file. The reason is that it can dramatically increase the time taken for a profile to run. However, if you want to be absolutely certain that SyncBack detects if a file has changed, so that it is copied, then you can enable this option. The only reason to enable this option is if you do not trust the last file modification date & time of the files, and the file size may not change.
Ignore file size changes: You can tell SyncBack to completely ignore any differences in file sizes. Ignoring the file size has no impact on performance.
Ignore file modification date & time changes: You can tell SyncBack to completely ignore the last modification date & time of a file. Ignoring the date & time has no impact on performance.
Ignore files that have not been modified/created within the last x days: You have the option of ignoring files that have not been modified recently, for example in the last 7 days.
Attributes to watch: SyncBack can be configured to watch for file attribute changes. Note that some attributes are not supported on some file systems. Only the NTFS filesystem supports all the attributes. FAT32/FAT16 file systems support only the Archive, Hidden, Read Only, and System attributes.
Note that SAMBA and non-Windows file systems may not support some of the attributes, or may require further configuration to support them.
When a files attributes are changed, SyncBack will copy the file. If hashing is used, then the file is not copied if the files contents are identical, and instead only the files attributes are changed.
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