These options are specific to the Left and Right sync folders, not to the job as a whole.
What Makes Files Differ
Compare Checksums when needed (slower) (un-checked by default)
If checked, compare the MD5 checksum of the Old to New file if the file size has not changed but the file mod time has.
If MD5 checksum of the file differs but File Size and File Mod Time are the same, declare a conflict.
After Sync, verify that the checksum of the copied file is the same on both sides.
If unchecked, the file is only considered to be changed if File Size or File Mod Time have changed.
Compare Attributes (Windows only, un-checked by default)
If checked, changes in file/folder Attributes are detected even when the file body does not change.
If unchecked, Attributes are copied only when the changed file is copied.
Compare Permissions (Mac and Unix only, un-checked by default)
If checked, changes in file/folder Permissions are detected even when the file body does not change. If unchecked, Permissions are copied only when the changed file is copied.
Compare Owner (un-checked by default)
If checked, changes in File Owner are detected even when the file body does not change.
If unchecked, the File Owner is copied only when the file body has changed.
Compare ACL (un-checked by default)
If checked, changes in ACL are detected even when the file body does not change.
If unchecked, ACL is copied only when the file body has changed.
Compare Extended Attributes (Mac only, un-checked by default)
If checked, changes in Extended Attributes are detected even when the file body does not change.
If unchecked, Extended Attributes are copied only when the changed file is copied.
Exotic options (advanced users only)
No _gsdata_ folder here (un-checked by default)
If checked, do not create _GSDATA_ folder in the sync folder on Left/Right side of the job.
Instead, create _GSDATA_ folder in the GoodSync profile folder on this computer.
If unchecked, create _GSDATA_ folder in the sync folder.
This option should be used only in situations where writing to sync folder is not possible or undesirable (read-only source side of 1-way job).
Use this option only for sync folders that are not synced with any other folder (by any other job on this or another computer).
Note: If this option is checked, these other options cannot be used:
Save Previous/Past Version, Save History.
Do Not List Folders During Analyze (un-checked by default, formerly Fast Pre-Analyze)
If checked, do not list folders to see what's in them during Analyze, instead trust GoodSync state file to provide file listings.
If unchecked, perform full Analyze.
This option can be used if only GoodSync (not you or another program) changes files in folder and sub-folders on this side.
Note: Misuse of this option can result in data corruption or loss. For advanced users only.
Safe Copy using temporary files (checked by default)
If checked, Sync does not copy source file directly to the destination file on this side, as an interrupt midsync would corrupt the file. Instead, Sync copies the source file to a temporary file in the destination folder and once the copy operation is finished, the temporary file is renamed to the destination file.
You may uncheck this option if you are doing 1-way backups and destination volume has limited free space.
This option is available only for file systems that do not have atomic upload (atomic upload means that until upload is complete, interrupting will revert to previous version of a file).
Client Side Encryption options
These options control file name and file body encryption that GoodSync can perform on the client side.
Encrypt File Bodies (un-checked by default)
If checked, Encrypt File Bodies before uploading them to this Left/Right folder.
AES with 256-bit key is used for encryption, with all file blocks chained.
Random salt is applied, so different encryptions of the same file will produce different results.
File size will increase by exactly 32 bytes.
Encrypt File Name (un-checked by default)
If checked, Encrypt File Names (inside the sync folder) before uploading them to this folder.
AES with 256-bit key is used for encryption.
Encryption Password (empty by default)
Password used to Encrypt File Bodies and/or Names.
You must memorize this password, or use RoboForm to store it in a Safenote.
File System Specific
Compress (Windows only, unchecked by default)
If checked, compress file bodies using native file system functionality.
Works only in NTFS. Compression will be done by Windows. Compressed attribute will be set.
Uncompress (Windows only, unchecked by default)
If checked, decompress file bodies using native file system functionality.
Works only in NTFS, decompression will be done by Windows.
FAT file system that does not reveal itself (Windows only, unchecked by default)
If checked, use the special time adjustment designed to neutralize FAT time storage problems.
If unchecked and if FAT is not reported by FS, assume that file system stores file mod time in UTC.